default hidden/disabled css rules
Merge branch 'master' of github.com:Heigvd/Wegas

# By Francois-Xavier Aeberhard
# Via Francois-Xavier Aeberhard
* 'master' of github.com:Heigvd/Wegas:
  PMG - Debug continued
  Proggame Fix issue in level positionning
  Add toString() to VariableDescriptor & VariableInstance