All the plumbing complete to observe stack states
Working stack state listeners in C++
tweaks to comments in demos
Working stack state callbacks in CLR
Simplified channel state callbacks using destructor hook to release managed heap
Added all required Java stubs for stack state listener
headers
Working implementation of stack state listener in Java
Small tweak to prevent java segfault
Added missing files to dnp3java project
Commmitted another missing java file to project