Fix premake user config
* Commas needed if commented back in.
Merge branch 'SDL' into gwork

Conflicts:
	gwen/Projects/inc/include.lua
Update read me for SDL2 Windows.
Remove unused variable warning.
Simplify Base::SetBounds(…)
* Add Rect comparison.
Fix Window centring due to Modal problem.
* I don't think layout called for Modal.
* Thanks McSimp.
* See https://github.com/McSimp/GWEN/commit/153e0f5d5f45531b10cfd05fc97978dd7dfba0bb
Base::Position(unsigned int pos, …)
* Make flags unsigned.