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

const corrections for string args and camel case `title_Msg` var name.