Added midpoint and distance functions for CGPoint.
Added midpoint and distance functions for CGPoint.

mohsinalimat/tapkulibrary,coresuite/tapkulibrary,pengleelove/tapkulibrary,weiyanwu84/tapkulibrary,joystate/CustomizebleCalendar,joystate/CustomizebleCalendar,yybutcher/tapkulibrary,venkadesh02/tapkulibrary,joystate/CustomizebleCalendar,joystate/CustomizebleCalendar,shads196770/tapkulibrary,adan016/tapkulibrary,bpap1989/test,triage/tapkulibrary