Browser: New navbar buttons

Added 2 new buttons to navigation bar:
 - New Incognito Tab
 - Goto home screen

Signed-off-by: Arham Jamal <arhamjamal@gmail.com>
Change-Id: I4c4b611ccc7fc3de4fa4bc7c855e4481de440a87
Browser: Increased tab limit

Increased tab limit from 16 to 64.

Change-Id: Icdf39ea8b568f50f63759f5dbacda8a70d41956b
Signed-off-by: Arham Jamal <arhamjamal@gmail.com>