RFR: 8356652: Input field ignores custom input source characters

[Martin Fox]

Under the hood the Keyman input method appears as a US English keyboard layout. The characters attached to an NSEvent are always US English Roman even if the selected Keyman layout is, say, Hebrew or Dvorak. Keyman sends the correct Hebrew or Dvorak character to insertText:replacementRange: instead.

This PR special-cases the Keyman layout, detecting it using the same method that AWT does. When Keyman is active Glass records the insertText: character and uses that when sending out KeyEvents.

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Commit messages:
 - Merge remote-tracking branch 'upstream/master' into keyman
 - Routing insertText character to KeyEvents for Keyman input method

Changes: https://git.openjdk.org/jfx/pull/1805/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1805&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356652
  Stats: 33 lines in 4 files changed: 27 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jfx/pull/1805.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1805/head:pull/1805

PR: https://git.openjdk.org/jfx/pull/1805