enum LogType could require some revision...

Reviewed some Vector3 functions
Added auxiliary Clamp() function

Replaced old GetExtension() function
Make IsFileExtension() public to the API

Moved to custom example, now raylib only supports simulated VR
rendering.
Oculus code was too device dependant... waiting for OpenXR.

Supports line thickness

It seems Sleep() behaves weird on my computer, disabled by default
returning to the busy wait loop... also re-implemented DrawFPS() to
avoid frame blitting...

- SetWindowPosition(int x, int y);
- SetWindowMonitor(int monitor);