firmware: control logic moved to a separate module

firmware: control logic moved to a separate module

- buttons.c now controls status LEDs only when setting parameters
- pattern.c:
	can use NULL instead of off_pattern
	has number_pattern() than can also set up inverted patterns
	contains only number and boot patterns as static variables
	can reload all patterns if some state changes
- ambient.c resets all patterns when ambient zone changes
- control.c:
	- now contains almost all pattern strings, only those needed by
		other modules are exported
	- status LED and illumination LED can be controlled by buttons.c
	- separate _pattern_select() function for each LED