recycle TypedArray calls in F_B

PS2: plus a few other minor fixups to typedarray handling
PS3: add a few more recycling calls and remove unnecessary try/finally from keybuttonview
PS4: remove all unused typedarray imports

-Vanir \m/

Change-Id: I004ce627a861a2c5e262709cb1110f5aea536719
Merge "recycle TypedArray calls in F_B" into jb43