Scite_Portable revisited

Finished scite.portable patch. ~done~ :)
-> checks for %Userprofile%.Scite
-> allows to define scite_userhome / scite_home with $(env.scite_userhome).

THAT ONE was a really tough nut to crack for me..

// yo.. filepath takes and returns (gui_string) which is a  basic_wstring (wchar_t) that converts from (std::wstring) Unicode loves to entertain me..