[CMake] Find modules for SDL2

[Benjamin Eikel]

Hello,

I have written find modules for SDL2, SDL2_image and SDL2_net (see attachment). 
I have tested them on Linux and Windows/MinGW with self-compiled SDL2 
libraries. I did neither test with Visual Studio nor on OS X. Feel free to use 
them if they are helpful for you (they are licensed under the standard license 
of CMake find modules).
My question: Is it good to create new find modules for SDL2, or should the 
existing SDL find modules be updated to search for SDL2?
If existing modules should be used: How to handle the case when both SDL and 
SDL2 are found?
If new modules should be created: Shall I create a topic branch for the new 
modules and create the missing ones (e.g., SDL2_mixer)?

Kind regards
Benjamin
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