ProjectExplorer: Use Core::Id as RunMode "enum values"

This provides a way for third-party plugins to implement run
modes without the need to add a value to the central enum or
using manual workarounds like RunMode(*(int*)&someUniqueObject).

Instead of centrally defined enum values this uses Core::Id that could
be defined anywhere.

Change-Id: Ic350e3d8dbb8042c61b2d4ffec993ca151f53099
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/ios/iosrunfactories.h

@@ -81,9 +81,9 @@ public:
     explicit IosRunControlFactory(QObject *parent = 0);
 
     bool canRun(ProjectExplorer::RunConfiguration *runConfiguration,
-                ProjectExplorer::RunMode mode) const override;
+                Core::Id mode) const override;
     ProjectExplorer::RunControl *create(ProjectExplorer::RunConfiguration *runConfiguration,
-                       ProjectExplorer::RunMode mode,
+                       Core::Id mode,
                        QString *errorMessage) override;
 private:
     mutable QMap<Core::Id, QPointer<ProjectExplorer::RunControl> > m_activeRunControls;