Changes

NEWT/EDTUtil: Allow get/set poll period, defaults to defaultEDTPollPeriod

Fix NEWT/Pointer Invisible: INVISIBLE_MASK was equal w/ CONFINED_MASK (duh)

NEWT/Pointer Confined: Dispatch mouse move events before enabled; Only request-focus/warp-ptr if enabled

Dispatch mouse move events before enabled
  - Allows user app listener to track to the new centered mouse position
    before using the confined position. This is important for position change usage.
    See simplified demo GearsES2

Only request-focus/warp-ptr if enabled
  - No need to request focus and center mouse if leaving confinement

Demo GearsES2:
  - No need to assume some position changes are erroneous (jumps)
    due to confinement.

  - Track unconfined mouse position, allowing confined navigation
    to have the proper position change value

NEWT/Mouse: Skip 'move' event w/ same position. Add Enter/Exit events

Skip 'mouse move' event w/ same position
 - On Windows, the OS sends us multiple event w/o change in position, suppress them

Add Enter/Exit events incl. synthesize 'enter' event for windows/osx
  - X11: using native Enter/Leave events
  - Windows: using native Leave event (tracking) and synthesized enter event
  - OSX: TODO (required for the confined feature, etc)

NEWT/OSX: Add mouse enter/exit and pointer features (visible, confined, warp) - cleanup pos/coord translations

Test GearsES2: Split confine mode to centered 'J' and non centered 'j', to test actual confinement