i2c: more idiomatic use of Python list, reduces redundancy, comments

Collect all bits of a byte time in a Python list (as was done before).
Eliminate the bit counter and the value accumulator, use the list's
length during accumulation and common conversion support after the
accumulation instead.

Also comment on the non-trivial start/end sample number update logic.
The decoder implementation likes to claim data validity outside of the
high SCL phase, which does not agree with the strict I2C protocol idea.
Increases usability though (data visibility at zoom levels). This and
backwards compatibility makes us keep the logic, as long as we remain
aware of its implications.

Comment on the rather unexpected LSB first emission of annotations and
stacked layer data passing, while the I2C protocol itself is MSB first.

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