Thaugdahl/image additions #5
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This PR adds some extra features to the TDT4102::Image class that allow for reading and writing pixel data. In addition, it adds a file load cache with O(1) membership querying for SDL_Texture *, SDL_Surface *, and image load paths.
Everything looks to be working, and the program doesn't trip up the address sanitizer. I am still to review the method by which I copy pixel data to and from the SDL_Surface, but the PR should be mostly feature-complete and has seen some testing.