LS Options ; preference categories and revise strings.

Credits; LiquidSmooth.
PEEK [2/2]

Add ability to switch peek on or off.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I1943221aa867099aeed001f3ff54ab83def90391
PEEK: configurable pickup timeout (1/2)

- Allow the user to set different pickup timeout when a notification comes up through PEEK.
Options:
10 sec (default)
30 sec
45 sec
1 min
2 min