Debugger: Infrastructure for reworked native mixed debugging

- Remove old experimental native mixed approach.
- Move some common stack parsing to Stackhandler.
- Mark gdbbridge.py debug output explicitly to remove it
  from actual reponse handling

New native mixed needs QtDeclarative changes and
QTC_DEBUGGER_NATIVE_MIXED=1 for now.

Change-Id: I09eed1da51cea878636d36756015b7bfaed34203
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/debugger/stackwindow.cpp

@@ -108,7 +108,7 @@ static inline StackFrame inputFunctionForDisassembly()
         return frame;
     const int bangPos = function.indexOf(QLatin1Char('!'));
     if (bangPos != -1) {
-        frame.from = function.left(bangPos);
+        frame.module = function.left(bangPos);
         frame.function = function.mid(bangPos + 1);
     } else {
         frame.function = function;