Add Hangul layout from https://github.com/Lee0701/openboard/tree/hangul
Further changes:
* merge current state and make it compile
* some formatting
* remove Korean dictionary (to be downloaded from original repo)
* add file in make-keyboard-text for auto-generating KeyboardTextsTable
* disable Hangul combiner when not using Hangul (otherwise symbols are seen as parts of a word)
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Co-authored-by: Lee0701 <hgl1002@naver.com>
* add language settings
* move to settings instead of language selection at end of setup wizard
* allow storing enabled subtypes in preferences
* make language selection and input method picker work with new system
* deal with weird issue of getSystemLocales returning inconsistent locales
* add details text to language settings
* make usused settings inaccessible
* better deal with "zz" subtypes, move hungarian (qwerty) from method.xml so a separate aditional subtype
* scrape some strings+translations from android system + latinime
* rename strings, add comment for unused string
This commit defines a new keyboard German (Germany) (country code de_DE) that includes the most important Umlauts äöü. The default alternate characters on longpress are set to the numbers, for u and o, since ü and ö have their own keys. ß is the new default alternate char for s.
The old German (country code de) keyboard based on a QWERTZ layout without umlauts remains in place.
