Enhance the dialog library a bit

[jacdelad]

I would like to see some minor additions to the dialog library, like autocreating columns in a listicon, setting a font for single gadget (with a font tag) or autosaving the id created with #PB_Any to a variable.

I read the help, but I couldn't find information to get this to work, so I assume this is not possible yet.

Edit: There's also a bug which calculates the space needed for a DateGadget with #PB_Date_CheckBox too short.