worker.mixin.RemoteMethodAccess: accessing new main threads too early

[tobiu]

It is an edge-case bug which does happen inside our colors app websocket demo:

the app worker tries to send messages to the new main thread => loading theme files, before these remotes have been registered.

2 options:

1. debug the "app is ready" => connect event to ensure it fires once all main thread addons are ready.
2. if a namespace does not exist yet, try again 100(?)ms later