Macintosh Gap_Filler Adds Dialog and Mouse Click Position Support

Release notes for v0.102 for Macintosh

• Added support for GF_Dialog (everything except the pop-up menu control).
• Added GF_MouseBtnLastDownPos, although it will report the wrong point if the layout is scrolled away from the top or left edges. This function uses a mouse tracking feature available only on OSX 10.4.9 (Tiger).
• Updated manual to be usable on the Mac.