Include major version number in library names and install dirs

[saschazelzer]

Append the CppMicroServices major version number to shared library names and default installation directories. This helps identifying the major version in use and enables easier parallel installations of different major versions.

New default paths:

• /usr/local/include/cppmicroservices3/ (include dir, containing cppmicroservices sub-dir)
• /usr/local/lib/libCppMicroServices.so.3.0.0 (Linux symlink, already done like that)
• C:/install/bin/CppMicroServices3.dll (Windows DLL with major version number)
• /usr/local/share/cppmicroservices3/ (auxiliary directory)