improvements/fixes

- can now handle control routine
- poll won't slow down GUI refresh by using new Luce frequency in
  start_manual
- if a control exists, it'll be executed with the provided frequency
- restart (or fully stop) the server when application is explicitly asked to quit
- accept
todo
LLiveClient: don't send nil, ever
LLive: don't reload control if it hasn't changed
Abort with server: set default to 1