* provide a way to also change the Crt unit
* PtcCrt does not declare the colors that Crt does, so declare them in Compat
* Additionally NormVideo, HighVideo, LowVideo, LastMode and TextMode are not declared
* enable the check for HercMono as otherwise x is not initialized
* two more CalcColor adjustments
* with the change to PtcCrt the "F5 hack" is no longer necessary, so revert the query of F5 back to F3
- a few more ifdefs that can be removed
* a few more CalcColor changes
* disable QuestMaker during refactoring