Debugger: Rework step{In,Out,Over} handling

Main menu action pass operation to current engine, everything else
is handled there.

Combine execute{Step,Next} and execute{Step,Next}I functions.
Implementation were mostly similar, in some cases unneeded
(the instruction-wise version e.g. for Python)

Drop GDB-isms 'step', 'next' in favor of 'step in' and 'step over'.

Change-Id: I232232bc7a67d9d297a74f1c81dc43be96787d34
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/qml/qmlengine.cpp

@@ -610,15 +610,7 @@ void QmlEngine::interruptInferior()
     showStatusMessage(tr("Waiting for JavaScript engine to interrupt on next statement."));
 }
 
-void QmlEngine::executeStep()
-{
-    clearExceptionSelection();
-    d->continueDebugging(StepIn);
-    notifyInferiorRunRequested();
-    notifyInferiorRunOk();
-}
-
-void QmlEngine::executeStepI()
+void QmlEngine::executeStepIn(bool)
 {
     clearExceptionSelection();
     d->continueDebugging(StepIn);
@@ -634,7 +626,7 @@ void QmlEngine::executeStepOut()
     notifyInferiorRunOk();
 }
 
-void QmlEngine::executeNext()
+void QmlEngine::executeStepOver(bool)
 {
     clearExceptionSelection();
     d->continueDebugging(Next);
@@ -642,11 +634,6 @@ void QmlEngine::executeNext()
     notifyInferiorRunOk();
 }
 
-void QmlEngine::executeNextI()
-{
-    executeNext();
-}
-
 void QmlEngine::executeRunToLine(const ContextData &data)
 {
     QTC_ASSERT(state() == InferiorStopOk, qDebug() << state());