Added manager events to conference actions

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4456 43c1dc8c-776e-4df2-8ef1-6e829299be21
Move pbx version specific calls to define.h and remove from sccp_conference

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4457 43c1dc8c-776e-4df2-8ef1-6e829299be21