Enable optional swipe based touch controls

Enabled via BOARD_RECOVERY_SWIPE := true in BoardConfig.mk.
Does not interfere with hardware keys, they continue to work.

Patchset 1) Initial set
Patchset 2) change Board Config variable
            don't add if BOARD_TOUCH_RECOVERY set
Patchset 3) more ifdef's for all!
Patchset 4) moved instructions
            even more stuff ifdef'ed
            no more abs name issues
Patchset 5) clean up commit message
Patchset 6) Move things to swipe.c to clean up ui.c
Patchset 7) white space

Change-Id: Id9844c38c31bd1985dd78a6d1dd81e71aa1f87f3