Added clock pause function
Added clock set function

ADDED: Clock can be set by using the '*' button adn entering 6 numbers.
The clock can still be paused and unpaused - also with the '*' button.
TODO: Display entered numbers as feedback to user
Finished clock function

Clock can be stopped, reset or set by pressing '*' and entering a time.
If the number is out-of-bounds, it is reset to 00:00:00.
Merged Baldur's branch with finish clock function

Conflicts:
	LCD interrupts/lcd.aws