MS_UTILS_ENTERSTRING moved from Jabber to the core, cause it's very handy

git-svn-id: http://svn.miranda-ng.org/main/trunk@7593 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
the same idea without double pointers

git-svn-id: http://svn.miranda-ng.org/main/trunk@7594 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c