Feature load multiple files, yes no dialog, password dialog.

•Multiple file paths are returned in a  vector <string> results;

in ofFileDialogResult

rewrote pc code in all functions using wchar_t

merged CB& VS code

added bool multipleItems=false in ofSystemSaveDialog

added system yesNoDialog
added ofSystemPassword
added a ofToUtf8 function

I couldn't figure out how to call poco::replace from down here ,
I think as it is, it does work with unicode paths in Codeblocks