Corrections about status/status messages

Status and status message are two separate things. Also, there is no invisible status in the core (yet) so it shouldn't be mentioned in the standard.
Merge pull request #26 from JFreegman/patch-1

Corrections about status/status messages
Move to new simplified tox:
Some STS changes
Add message splitting
whitespace splitting for messages
Update STS.md
`` ``
Change tox:// to tox:
Update STS.md
Make Tox data file save path more clear
Removed avatars from STS (not in core yet).
Missed a spot.
Merge pull request #36 from Astonex/patch-1

Make Tox data file save path more clear
Change data to tox_save.

tox_save is a more user friendly name than data.
All clients need a portable mode.
A/V support is mandatory.