allow adding seach paths by pasting path

[vladtepesch]

currently the gui only lets you specify search paths py picking with the folder-dialog. It should be possible to add a path by paste it from the clipboard.

Maybe either by adding an address edit box to the folder-selection dialog or by enabling clicking on on the

[robotboy655]

It should switch the Folder Select dialog to the modern one:

In c++ this is handled by the CFolderPickerDialog class.