multi-presentation support in JS client, etc.

Improve multi-presentation implementation in JS client and remove stateful
sync between presentation dropdown and internal array. Also added
start/stop presentation feature, made left-click on systray icon open
menu, and general bugfixing in backend.

Major rewrite of main module

Uses more event-driven syntax in main module to reduce refreshes, and
now supports multiple presentations (on the server side at least... a
bit more work needed in JS).

replace notify_state timer with PPT async events

bump version

temporarily disable settings - unstable

fix UI threading bugs

change default log level in OBS script

implement systray status

clients attempt reconnection after socket close

UI bugfixing

add stop function to systray icon

rewrite readme instructions for starting daemon at boot

bump version

implement remaining config options

replace client-triggered state refresh with server-triggered

remove lint

restructure project, add setuptools files

failsafe websocket client on OBS script

bugfixing, obs interface

add keyboard shortcuts, icons, preloading

fix threading bugs, add further HTML controls

initial commit