The number of generic menu entry specific files is growing which is
cluttering the Menu/ directory. Move the entries to a new subfolder.
Bug: T214540
Change-Id: I807d6f6034ee1924e3a606f5e6782c3298896825
* Introduce a HomeMenuEntry class and use it for adding the home menu link
* Provide override methods for text and CSS class
Bug: T223210
Change-Id: I37160887478cba829a6e2f10a4d8f87d95167556