started filetransfers caps implementation

git-svn-id: http://svn.miranda-ng.org/main/trunk@3270 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
implemented basic encrypted filetransfer capability checking (untested)

git-svn-id: http://svn.miranda-ng.org/main/trunk@3271 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c