rsgame - a heavily-inspired sandbox game

- Build Instructions -
Requirements:
	CMake 3.11+
	SDL 2
	OpenGL 3.2 Core / OpenGL ES 3.0
	libepoxy
	libpng
	zlib

Instructions:
	git submodule update --init --recursive
	cmake -S . -B build
	cmake --build build

For Windows builds, see extlib/INSTALL-WIN32.