New unit that adds IIF() support.
New unit that adds IIF() support.

This simplies various statements where I need to return a true or
false value. Nice for inline checks.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI