Handle watchpoint events

Watchpoint event handling is very similar to breakpoint event handling.
So, this commit mostly makes all handling methods template to allow them
handle both breakpoint and watchpoint LLDB objects.

Author: ilya-nozhkin

src/MICmnLLDBDebugger.cpp

@@ -389,6 +389,7 @@ bool CMICmnLLDBDebugger::InitSBListener() {
 
   const CMIUtilString strDbgId("CMICmnLLDBDebugger1");
   MIuint eventMask = lldb::SBTarget::eBroadcastBitBreakpointChanged |
+                     lldb::SBTarget::eBroadcastBitWatchpointChanged |
                      lldb::SBTarget::eBroadcastBitModulesLoaded |
                      lldb::SBTarget::eBroadcastBitModulesUnloaded |
                      lldb::SBTarget::eBroadcastBitWatchpointChanged |