Clear cache when a new member is added

This is required to get all members in the allMembers list properly,
making sure caches are all filled properly.

lib/metacode/class.cpp

@@ -135,6 +135,7 @@ void Class::addMember(ClassMember* member)
 {
     member->setParent(this);
     m_members.append(member);
+    m_allMembers.clear();
 }
 
 void Class::loadAdditionalMembers() const