- implement OSX parts
- check for some more QT functions, QtGlobal ones, qDebug, OS specific defines, etc
- make registry tab editable
- split System functions to more files
- cleanup Registry, simplify getters/setters (getIntEntry, getStringEntry etc..., templates?)
- make Registry and Settings Q_OBJECT and do proper listeners on that level
- if above remove get/set functions from tabs and use Registry/Settings slots directly
