Implement naming convention on QEE HLT2 lines and separate into Turbo/Full streams

FYI @fredi @hyin @dzuliani @wbarter @mvesteri @lugrazet (please share to anyone else who you think needs to know)

Also FYI @enoomen @poluekt @sstahl as it will affect HLT2 bandwidth division studies.

This MR makes two changes:

• In the same way as all the QEE sprucing lines are prefixed SpruceQEE_, our HLT2 lines are now all prefixed Hlt2QEE_. This will make them all easier to find and identify on any big list of lines that we see in the future. Just aesthetic/organisational.
• Split our lines in __init__.py into full and turbo dictionaries, and then use this split configuration in hlt2_pp_commissioning.py.

TODO:

• Test I didn't break any imports by categorising in this way.

(minor) I also gave a couple of the di{muon,electron} same-sign lines a longer and less-abbreviated name.