change build system to CMake and use SDL3 for everything

libs/SDL3/docs/INTRO-visualstudio.md

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+
+# Introduction to SDL with Visual Studio
+
+The easiest way to use SDL is to include it as a subproject in your project.
+
+We'll start by creating a simple project to build and run [hello.c](hello.c)
+
+- Create a new project in Visual Studio, using the C++ Empty Project template
+- Add hello.c to the Source Files
+- Right click the solution, select add an existing project, navigate to VisualC/SDL and add SDL.vcxproj
+- Select your main project and go to Project -> Add Reference and select SDL3
+- Select your main project and go to Project -> Properties, set the filter at the top to "All Configurations" and "All Platforms", select VC++ Directories and add the SDL include directory to "Include Directories"
+- Build and run!
+