Minimal thing to get working

DONE: finish summary store
DONE: move "sdk" bits over to "matrix" directory
DONE: add eventemitter
DONE: make sync work
DONE: store summaries
DONE: setup editorconfig
DONE: setup linting (also in editor)
DONE: store timeline
DONE: store state
DONE: make summary work better (name and joined/inviteCount doesn't seem to work well)
DONE: timeline doesn't seem to recover it's key well upon loading, the query in load seems to never yield an event in the persister
map DOMException to something better
- it's pretty opaque now when something idb related fails. DOMException has these fields: code: 0 message: "Key already exists in the object store." name: "ConstraintError"
emit events so we can start showing something on the screen maybe?
move session._rooms over to Map, so we can iterate over it, ...
build a very basic interface with
- a start/stop sync button
- a room list sorted alphabetically
do some preprocessing on sync response which can then be used by persister, summary, timeline
support timeline
- clicking on a room list, you see messages (userId -> body)
send messages
fill gaps with call to /messages
create sync filter
lazy loading members
decide denormalized data in summary vs reading from multiple stores PER room on load
allow Room/Summary class to be subclassed and store additional data?
store account data, support read markers