warnings with VS2019 /W3

[manxorist]

1>ACCADecompressor.cpp
1>API.cpp
1>ARTMDecompressor.cpp
1>BLZWDecompressor.cpp
1>BZIP2Decompressor.cpp
1>CBR0Decompressor.cpp
1>CRMDecompressor.cpp
1>CYB2Decoder.cpp
1>DEFLATEDecompressor.cpp
1>DLTADecode.cpp
1>DMSDecompressor.cpp
1>Decompressor.cpp
1>FASTDecompressor.cpp
1>FBR2Decompressor.cpp
1>FRLEDecompressor.cpp
1>HFMNDecompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\FBR2Decompressor.cpp(61,11): warning C4146: unary minus operator applied to unsigned type, result still unsigned
1>HUFFDecompressor.cpp
1>ILZRDecompressor.cpp
1>IMPDecompressor.cpp
1>InputStream.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\ILZRDecompressor.cpp(63,46): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
1>LHLBDecompressor.cpp
1>LIN1Decompressor.cpp
1>LIN2Decompressor.cpp
1>LZBSDecompressor.cpp
1>LZCBDecompressor.cpp
1>LZW2Decompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\LZBSDecompressor.cpp(66,49): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
1>LZW4Decompressor.cpp
1>LZW5Decompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\LZCBDecompressor.cpp(279,12): warning C4244: 'initializing': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\LZCBDecompressor.cpp(314,31): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>LZXDecompressor.cpp
1>LH1Decompressor.cpp
1>LH2Decompressor.cpp
1>LH3Decompressor.cpp
1>LHXDecompressor.cpp
1>LZ5Decompressor.cpp
1>LZHDecompressor.cpp
1>LZSDecompressor.cpp
1>PMDecompressor.cpp
1>MASHDecompressor.cpp
1>MMCMPDecompressor.cpp
1>NONEDecompressor.cpp
1>NUKEDecompressor.cpp
1>OutputStream.cpp
1>PPDecompressor.cpp
1>RAKEDecompressor.cpp
1>RDCNDecompressor.cpp
1>RLENDecompressor.cpp
1>RNCDecompressor.cpp
1>RangeDecoder.cpp
1>SDHCDecompressor.cpp
1>SHR3Decompressor.cpp
1>SHRIDecompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SDHCDecompressor.cpp(75,13): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SDHCDecompressor.cpp(92,13): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SDHCDecompressor.cpp(94,13): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>SLZ3Decompressor.cpp
1>SMPLDecompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SHRIDecompressor.cpp(48,12): warning C4146: unary minus operator applied to unsigned type, result still unsigned
1>SQSHDecompressor.cpp
1>SXSCDecompressor.cpp
1>StoneCrackerDecompressor.cpp
1>TDCSDecompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(200,46): warning C4244: 'argument': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(203,56): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(213,115): warning C4267: 'initializing': conversion from 'size_t' to 'uint16_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(650,27): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(734,24): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(746,26): warning C4244: 'argument': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(751,21): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>TPWMDecompressor.cpp
1>XPKDecompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\StoneCrackerDecompressor.cpp(181,25): warning C4101: 'e': unreferenced local variable
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\StoneCrackerDecompressor.cpp(520,25): warning C4244: 'argument': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\StoneCrackerDecompressor.cpp(581,41): warning C4244: 'argument': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>XPKMain.cpp
1>ZENODecompressor.cpp
1>ImplodeDecompressor.cpp
1>ReduceDecompressor.cpp
1>ShrinkDecompressor.cpp
1>ZIPDecompressor.cpp
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\Zip\ImplodeDecompressor.cpp(79,41): warning C4018: '>': signed/unsigned mismatch
1>Buffer.cpp
1>CRC16.cpp
1>CRC32.cpp
1>Common.cpp
1>MemoryBuffer.cpp
1>StaticBuffer.cpp
1>SubBuffer.cpp
1>WrappedVectorBuffer.cpp

[manxorist]

#30 silences the warnings that were definitely harmless.

I left the cases where I was not immediately sure untouched.
The following warnings still remain after this pull request:

1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\LZCBDecompressor.cpp(279,12): warning C4244: 'initializing': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\LZCBDecompressor.cpp(314,31): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SHRIDecompressor.cpp(48,12): warning C4146: unary minus operator applied to unsigned type, result still unsigned
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(200,46): warning C4244: 'argument': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(650,27): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(734,24): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(746,26): warning C4244: 'argument': conversion from 'uint16_t' to 'uint8_t', possible loss of data
1>C:\Users\manx\projects\openmpt\wc\trunk-8\include\ancient\src\SXSCDecompressor.cpp(751,21): warning C4244: '=': conversion from 'uint16_t' to 'uint8_t', possible loss of data

[temisu]

I'll check as soon as I have need to boot to windows..
(these are harmless)

[temisu]

Fixed (finally)