Utils: Merge BaseAspects and AspectContainer

They were quite similar, largest difference was the ownership of
subaspects, which is now handled by a bool property.

Change-Id: Ib3f2f20b9a84ef40ea8a9eb59da9c89c9a281750
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -543,7 +543,7 @@ RunConfiguration *RunConfigurationFactory::create(Target *target) const
 
     // Add the universal aspects.
     for (const RunConfiguration::AspectFactory &factory : theAspectFactories)
-        rc->m_aspects.append(factory(target));
+        rc->m_aspects.registerAspect(factory(target));
 
     rc->acquaintAspects();
     return rc;