Could not use array of string in these new functions and had to use TStringList. For consistency changed support function ISSigVerify to use TStringList as well.
Also, didn't need this in the end but kept it anyway: make TDownloadWizardPage's and TExtractionWizardPage's Add(Ex) a function returning the index of the added item, like all other adds.
Mostly done, I think. Still need to actually remove shWindowVisible etc. Still some Application.Handle references that need to be cleaned out. Still need to update help.
TMainForm still exists, but is no longer a form. Good enough for now.
With Application.MainFormOnTaskBar=True, we now have a working taskbar thumbnail and proper minimize/restore animations. Finally.
