Initial multilingual typing implementation

java/src/org/futo/inputmethod/keyboard/KeyboardSwitcher.java

...rg/futo/inputmethod/keyboard/internal/KeyboardParams.java

.../inputmethod/keyboard/internal/KeyboardTextsMultiSet.java

.../futo/inputmethod/keyboard/internal/KeyboardTextsSet.java

...src/org/futo/inputmethod/latin/DictionaryFacilitator.java

...org/futo/inputmethod/latin/DictionaryFacilitatorImpl.java

...futo/inputmethod/latin/DictionaryFacilitatorLruCache.java

java/src/org/futo/inputmethod/latin/LatinIMELegacy.java

...rc/org/futo/inputmethod/latin/RichInputMethodManager.java

...rc/org/futo/inputmethod/latin/RichInputMethodSubtype.java

java/src/org/futo/inputmethod/latin/Subtypes.kt

java/src/org/futo/inputmethod/latin/Suggest.java

...src/org/futo/inputmethod/latin/inputlogic/InputLogic.java

...utmethod/latin/spellcheck/AndroidSpellCheckerService.java

java/src/org/futo/inputmethod/latin/uix/Action.kt

.../org/futo/inputmethod/latin/uix/ImportResourceActivity.kt

java/src/org/futo/inputmethod/latin/uix/UixManager.kt

...rg/futo/inputmethod/latin/uix/actions/VoiceInputAction.kt

...rg/futo/inputmethod/latin/uix/settings/pages/Languages.kt

...rg/futo/inputmethod/latin/xlm/LanguageModelFacilitator.kt