Maintenance / Minor changes

[bcoconni]

This PR brings a number of minor changes:

• Gather some Windows specific code in python/CMakeLists.txt under a single if(WIN32) clause.
• Avoid duplication of the C++ files under the source folder python (a folder python/src was inadvertently created by CMake with a copy of all the C++ source code).
• Make the compiler stop complaining about hidden overloaded methods (warnings issued by clang on MacOSX and gcc>=13)
• Make the compiler stop complaining about missing override keywords (warnings issued by clang on MacOSX).
• Replace calls to sprintf by calls to snprintf to avoid buffer overflows (even if the risk was actually extremely remote as sprintf was used to print int, unsigned int or double in a buffer of 128 bytes which is unlikely to overflow). This avoids warnings from clang on MacOSX.

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (6f0c4d8) 24.87% compared to head (81814ce) 24.87%.

Files	Patch %	Lines
src/input_output/FGOutputType.cpp	0.00%	2 Missing :warning:
src/models/FGOutput.cpp	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1031 +/- ## ======================================= Coverage 24.87% 24.87% ======================================= Files 168 168 Lines 18908 18908 ======================================= Hits 4704 4704 Misses 14204 14204 ```

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