Add option to replace emoji key with different action

common/src/org/futo/inputmethod/latin/common/Constants.java

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

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

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

...g/futo/inputmethod/keyboard/internal/KeyboardBuilder.java

.../futo/inputmethod/keyboard/internal/KeyboardCodesSet.java

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

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

java/src/org/futo/inputmethod/latin/settings/Settings.java

...c/org/futo/inputmethod/latin/settings/SettingsValues.java

.../src/org/futo/inputmethod/latin/uix/BasicThemeProvider.kt

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

...c/org/futo/inputmethod/latin/uix/settings/pages/Typing.kt