[WIP] Safely change TPU offset on TS change or sync change

The TPU offset may vary some qbits, but on significant change, like a
change to a new time slot, the TPU offset is always incremented. Changing
backwards is performed by changing forwards and incrementing frame number.
(This is because we wrap arround into the next frame.)

The maximum amount of incrementation is half of a TDMA frame duration.
This way we can be sure that the TPU always generates next IRQ later.
If an incrmentation of more than half of a TDMA frame is required, the
incrementation is performed in two steps, thus we can can be sure
that each IRQ will always happen later.

Example:

TS 1 -> TS 2: increment by 625 qbits, keep same FN

TS 1 -> TS 7: increment by 2500 qbits, then by 1250 qbits, keep same FN

TS 7 -> TS 1: increment by 1250 qbits, increment FN

TS 2 -> TS 1: increment by 2500 qbits, then by 1875 qbits, increment FN

TODO: Prevent scheduling/transmission before and during change of TPU/FN.

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