Timepix3 updates

[magruber]

• Changes the event building in the raw_data_manipulation from ToA to ToA combined
• Adds the fToA of Timepix3 to the output of raw_data_manipulation and reconstruction

[Vindaar]

Both bugs (zeroes in ToA_combined output) and too large values in fTOA were related.

The first one was my bug. In ToA_combined I accidentally wrote the data as uint16 instead of uint64. This lead to each individual element being interpreted as 4 uint16 values, of which most of the time 3 were zeroes (interpreting a 64 bit "bigint" as 4 uint16 limbs will have most limbs zero if the uint64 values are usually small).

For the fTOA you then copied my bug and wrote the fTOA values, which should be uint8 as uint16. That treated 2 values as a single one of much larger size (hence the thousands).

I force pushed to your branch, because I would have had to rebase. And to better test locally (to make sure things work on latest HEAD), I rebased locally.