MindMap + currently building and working. pls let it stay that way... it currently works!!!!!!!!!!

actually currently missing ist the automativ actualisation of which
exercises are done!
Merge remote-tracking branch 'origin/dev' into dev

Conflicts:
	_source/_code/_cs/SoftwareProjekt/Forms/FrmHinterLinAbb.Designer.cs
	_source/_code/_cs/SoftwareProjekt/Forms/FrmLinAbbSumBelVek.Designer.cs
	_source/_code/_cs/SoftwareProjekt/Forms/FrmLinAbbVielBelVek.Designer.cs
	_source/_code/_cs/SoftwareProjekt/Forms/FrmSpiegLinAbbUrsp.Designer.cs
	_source/_code/_cs/SoftwareProjekt/Forms/FrmUmkehrungLinAbb.Designer.cs
	_source/_code/_cs/SoftwareProjekt/Forms/FrmZuordAffAbb.Designer.cs
	_source/_code/_cs/SoftwareProjekt/Forms/FrmZuordvorLinAbb.Designer.cs