big reshuffle:
* try to make 00_basis slightly more accessible and less terse
* move CS API before Events, as it's meaningless to dive into specific events if you haven't been introduced to how the CS API works
* Try to improve the beginning of the CS API by merging back in some of kegan's original v1 content (which has subsequently been deleted somewhere along the line?)
* document m.presence event consistently
* move typing from drafts to spec
* move push stuff from drafts to spec
...and lots of other stuff
move push & typing from drafts into main spec.
