Introduce a new module event to be called after the virtual machine was destroyed. Thus, preventing the release of the virtual machine while still in use.

Prevent releasing IRC sessions while they could still be in use.
Few other changes that had to be committed because of the change in the module API.

shared/SqMod.h

@@ -58,6 +58,7 @@ extern "C" {
     #define SQMOD_INITIALIZE_CMD    0xDABBAD00
     #define SQMOD_LOAD_CMD          0xDEADBABE
     #define SQMOD_TERMINATE_CMD     0xDEADC0DE
+    #define SQMOD_RELEASED_CMD      0xDEADBEAF
     #define SQMOD_API_VER           1
 
     //primitive functions