Introduction of AUTO_RELEASE for refcounted objects

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5413 43c1dc8c-776e-4df2-8ef1-6e829299be21
Use AUTO_RELEASE for sccp_event objects

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5414 43c1dc8c-776e-4df2-8ef1-6e829299be21