Changes

DefaultGLCapabilitiesChooser: Punish sample extension mismatch also if req == default && req != given

NEWT: Add pointer features: visibility, confined and warp (move)

visibility:
  - set pointer visible or invisible

confined:
  - confine pointer to window, or not

warp:
  - set mouse position within the window

Implemented for X11, tested manually with TestGearsES2NEWT (see code for action keys).

TODO: Windows, MaxOSX and Android (limited)

NEWT Pointer Feature: Add Windows impl. ; Fix test (warp action) ; Minor cleanup in X11