[Feature] Allow manual adjustment of climate setpoint

[Nuuki9]

Currently, when MA is managing Climate Control, it re-applies the relevant climate preset continuously. This means that its not possible to manually adjust the heating target setpoint - it gets reset by MA back to the preset value.

Being able to adjust heating from a base scedhule or preset is a very common use case - the "feels like" temperature in a room isn't only a factor of the temperature (humidity also plays a large role), plus different people, or indeed the same person, may just want it a little warmer or cooler. As such being able to manually adjust up or down as needed is a reasonable expectation.

One fix would seem to be to only apply the preset once, when the relevant state conditions apply. Not knowing the underlying architcture, this may be easier said than done, but from an end user standpoint its likely the cleanest implementation.

There's some superficial overlap with #509, though as that one is looking at a different situation I wanted to log this one separately.