Debugger: Rework GDB disassembly display

- Use exclusively CLI to retrieve information. MI output misses parts.
- Remove MI output handling
- Re-order lines in ascending address order in mixed output.
  GDB orders by source line, but that's confusing when stepping
- Introduce a new 'hunk' field for source lines to give a hint
  which part of a split source line we are looking at.

Change-Id: I61a547503e9a18f95e99b897e26dbb207cabb8cf
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/debugger/disassemblerlines.cpp

@@ -227,6 +227,8 @@ QString DisassemblerLine::toString() const
         str += _("        ");
         str += data;
     } else if (isCode()) {
+        if (hunk)
+            str += _("[%1]").arg(hunk);
         str += someSpace;
         str += data;
     } else {