Check up on the TWI Handler code

[Xasin]

No changes need be done, although I would like to:

• [x] Remove the base-class TWI and change it to a namespace instead.
  • [x] Probably even the TWI-Handler. The TWI-Jobs can NOT be made Namespaces, their pointers are needed!
  • [x] There could also be some really good re-structuring of how the sequences works (As in, make it easier to interface and configure from within the jobs)
• [ ] Comment the lines a LOT more
• [x] Add an enum for the TWI status codes, instead of the countless #defines.
• [x] Change the Jobs - We don't need two, just one type with a "Master/Slave" flag.

[Xasin]

Going great so far! Now I just need the commenting ... >.>

[Xasin]

TBH commenting can be done later, if needed. Let's archive this until it's needed