RFR: 8242167: ios keyboard handling

[Johan Vos]

Use JavaFX controls for TextField and TextArea instead of the native iOS ones
This fixes JDK-8242167

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Commit messages:
 - Use JavaFX controls for TextField and TextArea instead of the native iOS ones

Changes: https://git.openjdk.java.net/jfx/pull/158/files
 Webrev: https://webrevs.openjdk.java.net/jfx/158/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242167
  Stats: 367 lines in 12 files changed: 288 ins; 76 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx/pull/158.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/158/head:pull/158

PR: https://git.openjdk.java.net/jfx/pull/158