various refactoring

[sanderland]

• [ ] player config, via a single store/model + update all gui views
• [ ] game state, in gamenode instead of game? faster nav, allow ae etc better. mem use seems ok?
• [ ] config/logs factored out so they can be used before window is loaded?
• [ ] scaling of dialogs/fonts, via config?
  • auto sizing widgets. track lines in description, adjust?
• [ ] consolidate ai options
• [x] wrap soundloader into something more stable
• [ ] core utils non kivy dependent for engine etc