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 : Open in incognito tab

Long click on a link now allows you to choose
between opening in incognito/regular tab.

Credits: Danesh M

Signed-off-by: Arham Jamal <arhamjamal@gmail.com>
Change-Id: Iba8e7446e69ae66e0bd957910e6309fdb0e0b947
Increase tab limit from 16 to 64

Change-Id: Ifc756734d86644f0272e63bb4b04a2c505a9a616