make about dialog boxes use standard wx about dialogs

Any information in dialog can be easily changed without much effort
and the dialog can be easy translated.

Unfortunately on Windows there is no good standard about dialog,
therefore own implementation is used there.

[TOPOLOGY]
NetName=None
Nodes=0x01
Node2Present=0x01
Node2Name=SlaveNode
Node2DCFName=Slave_0_0.eds
EDSBaseName=eds