[Shell,iOS,Android] Add Colors, Font, HorizontalAlignment. Keyboard, Focus to SearchHandler (#5810)
* [Shell,iOS] Add Colors, Font , HorizontalAlignment and keyboard support to SearchHandler
* {Android]Allow set colors and customize text on Shell SearchHandler
* [Android] Update icons color on SearchView
* [Android] Update Placeholdericon color from one place
* [iOS] Update shell cancel button colours
* [iOS,Android] Update IconPlaceholder color
* [Core] Fix missing region
* [Controls] Add shell SearchHandlerPage
* [iOS] Fix alignment changes on SearchHandlerAppearanceTraccker
* [Shell,Core] Add focus to SearchHandler
* [Android] Add SearchHandler focus
* [iOS] Add SearchHandler focus
* [Controls] Reuse dynamic gallery for SearchHandler
* [Controls] Fixes to gallery
* [Android] Remove cancel button code
* [Android] Add extension point for SearchHandlerAppearanceTracker
* [Android] Fix spelling
* fix bad merge
fixes #3125
fixes #5768
e231882214