The program is started in core/manager.h
* Load DC++ stuff (create all *Managers)
* Generate random default nick
* Create nanodc stuff (settings, logger)
* Connect hubs
* Start input and event threads

Input thread reads user input and emits "key pressed" events.

Event thread waits for events and calls event handlers.

The screen is currently updated from only on thread, which
is the event thread. The screen is updated after "window updated"
event that is handled by ui::Manager::redraw_screen. redraw_screen 
locks the screen mutex and calls display::Manager::redraw
which actually draws the current window, status bar and stuff
on the screen.