added folders plugin support

git-svn-id: http://svn.miranda-ng.org/main/trunk@3264 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
- CmdLine +1 string
- QuickSearch +2 strings

git-svn-id: http://svn.miranda-ng.org/main/trunk@3265 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c