rework the plugin system

[wsrvn]

the current plugin system in use is ridiculously bad, and admittedly was this way since the very inception. the overall vision for the rework is as follows:

• make plugins.ts actually matter
• allow hot reload for the plugins or at least configs
• allow plugins to be enabled/disabled without restart (preferably using a ui component)

in this process, it would likely be a decent idea to also make several plugins make sense, e.g. dont have the entire vote logic inside a button widget. the ui plugin is like systemd atp, that shouldnt be the case...