NEWT KeyEvent: Use UTF-16 UniCode for key-code and key-symbol exposing well defined key encoding and simplify usage.

Note, we use one collision to reduce key-code range:
  [0x61 .. 0x78] keyCodes [F1..F24] collide w/ ['a'..'x']

  Since keyCode/Sym won't use lower capital a-z, this is a no isssue.

KeyEvent:
  - 'printable' type is being determined by a nonPrintableKeys table,
    while 'action' type is set in case !printable and !modifier.

  - public ctor hidden, use create(..) method instead.
    This allows us to ensure modifier bit are properly set (incl. the keySym one) w/o performance loss.
  - ctor validates that only one of the type flags is set, printable, modifyable or action.

WindowImpl:
  - Using IntBitfield of 255 bits to track pressed state,
    while removing the repeat state tracking since it is redundant.
    The Windows impl. uses a single field to validate whether a key
    was already repeated or not.
  - Properly cast keyCode short values to int for tracking!

AWTNewtEventFactory, SWTNewtEventFactory:
  - Add translation of keyCode/Sym from and to NEWT
  - All tested via:
    - Newt -> Awt for AWTRobot
    - OSX CALayer: AWT -> NEWT
    - SWT tests

X11:
  - Add VK_CONTEXT_MENU mapping (XK_Menu)

LinuxEventDeviceTracker:
  - Fix apostrophe and grave mapping, i.e. to VK_QUOTE and VK_BACK_QUOTE.

Adapted all unit tests, especially:
  - TestNewtKeyCodesAWT: More fine grained keyCode ranges to test
    using proper keyCode symbols.

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