[tado] Fix AC control bugs; Add null annotations and checks (#12570)

[tado] Fix AC control bugs; Add null annotations and checks (#12570)

* [tado] add null annotations and checks
* [tado] cosmetics
* [tado] tweak homeid
* [tado] revert int to Integer
* [tado] explicit method public declaration
* [tado] remove "Bridge not initialized" exception on shutdown
* [tado] new state values: error if unsupported; don't force defaults
* [tado] adopt reviewer suggestion
* [tado] tweaks
* [tado] use new,current,default mode for target capabilities; cosmetics
* [tado] eliminate dead code
* [tado] set or defaults
* [tado] change 'nullable Integer' to 'int'
* [tado] eliminate warning if handler already disposed
* [tado] improve json logging
* [tado] fix getTargetTemperature if state is OFF
* [tado] add null checks
* [tado] log warning instead of throwing exception
* [tado] improved json trace logging
* [tado] adopt reviewer suggestion
* [tado] fix logging to trace
* [tado] thread synch, and fix 'this' assignments on futures
* [tado] tweak yaml
* [tado] fix verticalSwing
* [tado] fix fanLevel

Signed-off-by: Andrew Fiddian-Green <software@whitebear.ch>