Update many of the names and calls in TrigInDetConfig

Some of the function and file names were very opaque - these have now been modified using a more consistent and hopefully clearer naming convention. Namely ...

files:
InDetSetup.py -> InDetTrigFastTracking.py
InDetPT.py    -> InDetTrigPrecisionTracking.py

interface:
makeInDetAlgs              -> makeInDetTrigFastTracking
makeInDetPrecisionTracking -> makeInDetTrigPrecisionTracking