add progress bar to status bar

It can be used to display progress during program upload.
To use it call ShowPLCProgress (like ShowPLCProgress("transfered",
10)) in your PLCObject implementation.

[TOPOLOGY]
NetName=None
Nodes=0x01
Node64Present=0x01
Node64Name=micromod
Node64DCFName=PEAK MicroMod.eds
EDSBaseName=eds