- end of ANSI support in chats;
- manual crit section control removed from chat engine;
- bunch of memory-related clutches either removed or replaced with smart pointers

git-svn-id: http://svn.miranda-ng.org/main/trunk@7549 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
initial version of VK chats (invisible for a while)

git-svn-id: http://svn.miranda-ng.org/main/trunk@7550 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c