SystemUI: Screenshot Toggle

onClick: Screenshot now(collpase status bar)
onLongClick: Starts 'timer' and screenshot after timer expires

PS2: Remove rebootmenu calls from PWM and add 500ms delay to allow statusbar to
         fully collapse

PS3,4: Redependcize commits
PS5: Secure Screenshot
PS6: Resolved conflicts
PS8: Respect RC delay setting & fix drawable padding
PS9: Removed to-do
PS10: collapseStatusBar() for longclick and added toast
PS11: reduce toast length to avoid capturing it. also make it translatable

Signed-off-by: bmc08gt <bmc08gt.teamb00sted@gmail.com>
Change-Id: I2cebb23e530a92901319b7171c3934125568c3ab