Refactor the Config and ConfigGroup classes to match the JSON data class
pattern with toJSON, toRemote and fromJSON methods replacing the load,
init, and serialize methods. Since fromJSON requires extra information
the messages structures passes around the plain JSON representation of
the configs instead of serialising instances of the config classes
automatically.
Move BaseControllerPlugin to controller/src/BaseControllerPlugin.ts
Move BaseInstancePlugin to host/src/BaseInstancePlugin.ts
Move BaseControlPlugin to ctl/src/BaseCtlPlugin.ts
Move BaseWebPlugin to web_ui/src/BaseWebPlugin.ts
This solves the circular package dependency problem of the base plugins
needing types that are available only in the dependencies to lib.
Be consistent with the usage of tabs as indents in all JSON files in the
project. This makes it easier to configure editors to emit the right
indents when manually editing these files.