Deprecate TooManySeeks, instead of removing

[ferdnyc]

Recently (in #611) I removed the TooManySeeks exception, which has been unused in the code since 2015.

But, just because we don't use it doesn't mean that nobody ELSE uses it. So, in case any of the library's consumers are still catching TooManySeeks (as we no longer do), to avoid breaking their code this PR restores the exception. However, both the class and the constructor are marked as deprecated, causing both g++ and clang++ to emit a warning if it's used:

g++:

[ 60%] Building CXX object src/CMakeFiles/openshot.dir/Qt/PlayerPrivate.cpp.o
src/Qt/PlayerPrivate.cpp: In member function ‘std::shared_ptr<openshot::Frame> openshot::PlayerPrivate::getFrame()’:
src/Qt/PlayerPrivate.cpp:178:35: warning: ‘TooManySeeks’ is deprecated: The library no longer throws this exception. It will be removed in a future release. [-Wdeprecated-declarations]
  178 |     } catch (const TooManySeeks & e) {
      |                                   ^
In file included from src/Qt/PlayerPrivate.cpp:33:
src/Exceptions.h:375:2: note: declared here
  375 |  TooManySeeks : public ExceptionBase
      |  ^~~~~~~~~~~~

clang++:

[ 61%] Building CXX object src/CMakeFiles/openshot.dir/Qt/PlayerPrivate.cpp.o
src/Qt/PlayerPrivate.cpp:178:20: warning: 'TooManySeeks' is deprecated: The library no longer throws this exception. It will be removed in a future release. [-Wdeprecated-declarations]
    } catch (const TooManySeeks & e) {
                   ^
src/Exceptions.h:373:18: note: 'TooManySeeks' has been explicitly marked deprecated here
        __attribute__ ((deprecated (TMS_DEP_MSG) ))
                        ^
1 warning generated.

TooManySeeks is also excluded from the SWIG bindings entirely using #ifndef SWIG.

A separate commit in this PR moves most (all?) #include "Exceptions.h" lines from the header files to their corresponding .cpp files, to reduce unnecessary recompilations and header bloat.

[codecov]

Codecov Report

Merging #618 (2f3615f) into develop (2563c3c) will not change coverage.
The diff coverage is 14.28%.

@@           Coverage Diff            @@
##           develop     #618   +/-   ##
========================================
  Coverage    52.24%   52.24%           
========================================
  Files          129      129           
  Lines        10774    10774           
========================================
  Hits          5629     5629           
  Misses        5145     5145           

Impacted Files	Coverage Δ
src/AudioReaderSource.cpp	0.00% <ø> (ø)
src/CacheBase.h	75.00% <ø> (ø)
src/CacheDisk.cpp	71.69% <ø> (ø)
src/CacheMemory.cpp	90.07% <ø> (ø)
src/CacheMemory.h	0.00% <ø> (ø)
src/ChunkReader.cpp	0.00% <ø> (ø)
src/ChunkWriter.cpp	0.00% <ø> (ø)
src/ChunkWriter.h	0.00% <ø> (ø)
src/Clip.cpp	43.74% <ø> (ø)
src/ClipBase.h	80.76% <ø> (ø)
... and 57 more

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[ferdnyc]

Merging this, as it's what I should've done in the first place. (It just took me a bit more time to figure out the right syntax for deprecating a class, and to ensure that it worked with both GCC and Clang.)