Remove unnecessary this-> (C++ is not JS)
Fix sound (Commenting this will break things)
Support newlines in categories
Migrate to external stylesheet file
Fix derived define
Simplify code
Update to newer QTcreator
Update .gitignore
Use QT object cleanup
Somehow working
Fix missing offsets - this needs cleanup anyway
Celanup
Enhance round to know its id
Get rid of unnecessary this->
Cleanup
Fix rand
Extend answer to know the round id
Make category a normal object
Fix warning
Use extra function to load roundfile 
instead of throwing excerption in constructor - QT does not seem to like
exceptions.