Debugger: Make DebuggerEngine::runCommand() virtual.

Allows default implementation of e.g. stack retrieval in the base
class.

Change-Id: I96460b19aa31347b2c863736b4ce2b5046eb4de6
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/debugger/pdb/pdbengine.cpp

@@ -300,7 +300,7 @@ void PdbEngine::loadAllSymbols()
 
 void PdbEngine::reloadModules()
 {
-    runCommand("listModules");
+    runCommand({"listModules"});
 }
 
 void PdbEngine::refreshModules(const GdbMi &modules)
@@ -557,7 +557,7 @@ void PdbEngine::refreshStack(const GdbMi &stack)
 
 void PdbEngine::updateAll()
 {
-    runCommand("stackListFrames");
+    runCommand({"stackListFrames"});
     updateLocals();
 }