keypad: -dead code
keypad: sample keys to eliminate bounce

- scan rows/columns three times each at 5ms intervals.
- when a key is detected, disable the keypad for 200ms
dead code
remove keypad testing code
move key handling to a function
changes for new board
keypad: change the key repeat rate
display: fix displaying integers containing 0
display: add map for r
display: improve display of 'r'
add ability to set temperature
keypad: fix key repeat errors? (hack)
tea: make temperature configurable
Add code to start/stop tea
moar temperature setting
s/tea_status/device_state
complete tea brewing cycle
timer: small memory reference error
timer: HACKS allow manipulating timers while in interrupt context
add mp3 code