min/g3n-engine: Go 3D Game Engine http://g3n.rocks Fork from https://github.com/g3n/engine @ edits

Min 7ece3f26c0 Added additional functions		6 lat temu
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canvas.go	31fc77e272 Fix and improve window implementations	6 lat temu
glfw.go	7ece3f26c0 Added additional functions	6 lat temu
keystate.go	92ffbdeab4 Move KeyState to window package	6 lat temu
window.go	7ece3f26c0 Added additional functions	6 lat temu