ProjectExplorer: Add an official way to connect aspects

Aspects are not completely orthogonal, e.g. working directory
depends usually on environment etc. So far handling this used
ad-hoc set up in the (Run)Configuration constructor. Lets make
this an official second phase, that also reduces the need to
use a specific construction order of aspects.

Change-Id: Ic98b7d4e1ac9d46a32ec624bbbbfbbc32a40ab32
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/projectexplorer/projectconfiguration.cpp

@@ -181,6 +181,12 @@ ProjectConfigurationAspect *ProjectConfiguration::aspect(Core::Id id) const
     return m_aspects.aspect(id);
 }
 
+void ProjectConfiguration::acquaintAspects()
+{
+    for (ProjectConfigurationAspect *aspect : m_aspects)
+        aspect->acquaintSiblings(m_aspects);
+}
+
 Core::Id ProjectExplorer::idFromMap(const QVariantMap &map)
 {
     return Core::Id::fromSetting(map.value(QLatin1String(CONFIGURATION_ID_KEY)));