Modified GAPP bar

**Modified GAPP bar**:
- Moved search bar from top-bar to gapp-bar.
- Added drop-down to decided (*File*, *Page*, *Task*) GAPP's.
  - Pending: *Event* GAPP.
- If the no of app's are going beyond available width:
  - New ```...``` is added at last of gaap-bar dynamically, which contains the extra GAPP's.

<hr/>

Test above features in the commit.