statusbar: performance and fixups

kill debugging simplify and improve..
fix status brightness slider
fix NFC toggle not working until shade is collapsed
fix expanded toggle not working until shade is collapsed
remove empty onLongClick listeners
static hashmaps
consolidate content observers since their sole purpose is to refresh toggle
    state when the setting is toggled from elsewhere in the ROM

Change-Id: I70e2e1233a2faaf5b374bcdd4ec2f5075a09dedc