CustomExecutableRunConfiguration: Remove nested event loop

Nested event loops are dangerous and in this case lead to a crash.
So change the api of ensureConfigured to not use a nested event loop.
The CustomExecutableRunConfiguration then has to manage the dialog more
explicitly. Also this makes the dialog non modal, since it should then
cope with every situation.

Task-number: QTCREATORBUG-11416
Change-Id: I2af782915c148f8dff1b0df54fdb64aa83f684d2
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -273,13 +273,13 @@ bool RunConfiguration::isConfigured() const
     return true;
 }
 
-bool RunConfiguration::ensureConfigured(QString *errorMessage)
+RunConfiguration::ConfigurationState RunConfiguration::ensureConfigured(QString *errorMessage)
 {
     if (isConfigured())
-        return true;
+        return Configured;
     if (errorMessage)
         *errorMessage = tr("Unknown error.");
-    return false;
+    return UnConfigured;
 }