Update the SDL2 CMake modules

[pinotree]

• drop FindSDL2.cmake, since SDL2 ships config files for CMake already
• drop FindSDL2_image.cmake, as SDL2_image is not used
• update the license text of FindSDL2_ttf.cmake

[pinotree]

Needs more testing -> draft for now.

[codecov-commenter]

Codecov Report

Merging #190 (6895601) into master (b491952) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master     #190   +/-   ##
=======================================
  Coverage   94.78%   94.78%           
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  Files          81       81           
  Lines        2875     2875           
=======================================
  Hits         2725     2725           
  Misses        150      150           

[arximboldi]

It seems the build passed, what kind of further testing would you like to have?

[pinotree]

what kind of further testing would you like to have?

I was not sure yet about the approach to do for FindSDL2_ttf.cmake, since the main problem I wanted to solve was the lack of the license text (mentioned there); while the original idea was also to provide a newer/better version of it, in the end I chose to simply fix the license text, and keep the existing module (which works fine).

Hence, it should be fine to review now, thanks!

[arximboldi]

Thank you!!