0.9.0

[talesm]

Thanks to @kinderhead we found some cross-compiler compatibility problems caused
by accidentally using gcc specific extensions, specially constexpr being used
where it does not really applies. I worked with him to get it to compile on MSVC
and updated the github actions to build and test to both MSVC and Clang in
addition to GCC we already were testing.

As removing constexpr is kind of a compatibility break, I bumped to 0.9.0 and
included other breaking change in my backlog, the complete list of changes are
bellow:

• Make StringParam differentiate nullptr from "";
• On Windows, downloads pre-compiled versions, if possible.
• Disambiguate between SDL_image and SDL's load/save surface functions;
  • Remove wrappers for IMG_LoadBMP_IO, IMG_SaveBMP and IMG_SaveBMP_IO, as they
    just call SDL's version of these;
  • Rename wrapper for SDL_LoadPNG_IO to LoadTrustedPNG_IO;
  • Rename wrapper for SDL_LoadPNG to LoadTrustedPNG;
  • Rename wrapper for SDL_SavePNG_IO to SaveTrustedPNG_IO;
  • Rename wrapper for SDL_SavePNG to SaveTrustedPNG;
• Remove Surface::Load* functions:
  • Remove Surface::LoadBMP_IO(), use freestanding LoadBMP_IO() instead;
  • Remove Surface::LoadBMP(), use freestanding LoadBMP() instead;
  • Remove Surface::LoadPNG_IO(), use freestanding LoadPNG_IO() instead;
  • Remove Surface::LoadPNG(), use freestanding LoadPNG() instead;
• Create Surface::Save();
• Wrap TTF_OpenFontIO to just OpenFontIO, instead of overloading with OpenFont;
• TTF_PROP_FONT_CREATE_EXISTING_FONT is now wrapped by CREATE_EXISTING_FONT
  (removed the misleading _PONTER prefix);
• Fix bug preventing compilation on VisualStudio
  • Use of gnu extension ?:;
  • Use of invalid constexpr;
• Fix Thread ctor for wrapped functions;
• Added CI tests for linux/Clang and Windows/MSVC;
• Remove src/generated/ from version control;
• Warnings fixes:
  • operator-> const for resources;
  • Fix Camera::AcquireCameraFrame;
  • Add SDL_assert on all narrowing due to different between std and SDL size
    types width;
  • Don't default shared resources' copy assignment operators;
  • Remove copy assignment operators on non-copyable resources;
  • Remove copy constructors on non-copyable resources;
  • Simplify scoped resources constructors and assignment operators;
  • Fix several minor warnings;
• Properly encapsulate Param and ConstParam legacy:
  • Create template for ConstParam;
  • Create template for legacy Param;
  • Make value private and rename to m_resource.