some crash fixes for Skype

git-svn-id: http://svn.miranda-ng.org/main/trunk@4589 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
Skype: cleanup for the SRMM button

git-svn-id: http://svn.miranda-ng.org/main/trunk@4590 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
- partly fixed chat reaction on incoming call

git-svn-id: http://svn.miranda-ng.org/main/trunk@4591 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
memory leaks

git-svn-id: http://svn.miranda-ng.org/main/trunk@4592 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
more mem leaks

git-svn-id: http://svn.miranda-ng.org/main/trunk@4593 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
- we display SRMM button only for Skype contacts;
- service & hooks list aren't needed for a while

git-svn-id: http://svn.miranda-ng.org/main/trunk@4594 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c