+semver:minor Added KeysExtensions class with the IsNavigationKey ext…

[tombogle]

…ension method.

Fixed a subtle bug in IbusKeyboardSwitchingAdaptor when determining whether IBus would have handled a key event while a pre-edit is active. The code now accounts for the possibility of modifier keys (particularly Ctrl), which IBus would presumably have handled when in combination with navigation keys, Backspace, and Delete.

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This change is 

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Palaso Tests

     4 files  ±0       4 suites  ±0   10m 11s :stopwatch: -4s  5 053 tests ±0   4 819 :white_check_mark: ±0  234 :zzz: ±0  0 :x: ±0  16 411 runs  ±0  15 708 :white_check_mark: +1  703 :zzz:  - 1  0 :x: ±0 

Results for commit 218fd907. ± Comparison against base commit db3fec82.

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