Add config overriding and loading of external plugins

[AroPix]

Right now, it is very annoying to update trakman especially with Docker containers (also the Update.js script is broken on dev), because the user needs to manually go in and review the changes that have been made. With this approach, we could instead ship the container with a statically compiled version of Trakman, and the user can configure the controller through adding config overrides, as example:

export default { title: 'test2' }

inside overrides/plugins/ui/static_components/race/LiveRanking.config.js, which will have priority over the Trakman "default" config.

I already ship my servers with a static version of trakman, but this way i could come closer to upstream again, and i have helped a person to deploy a trakman server using docker, through which i noticed that the current process is not ideal.

This pr also adds the functionality to add extra plugins, which i can load through overriding the Config.js file as example with the following content:

export default { externalPlugins: [ '../custom_plugins/emojis/Emojis.ts' ] }

This would load my custom emojis plugin, which resides in a different folder. For users that run it bare metal, they could still change the files as they did before, or they might adapt to using it aswell.

It is not ideal yet, i would love to get some feedback on it.