MessageComponent

It feels weird to have anything that needs MessageComponent have to depend on all of MessageContentModel and pull in it's dependencies. This moves MessageComponent into its own header.

src/models/messagecontentmodel.h

@@ -11,24 +11,9 @@
 
 #include "enums/messagecomponenttype.h"
 #include "itinerarymodel.h"
+#include "messagecomponent.h"
 #include "neochatroommember.h"
 
-struct MessageComponent {
-    MessageComponentType::Type type = MessageComponentType::Other;
-    QString content;
-    QVariantMap attributes;
-
-    int operator==(const MessageComponent &right) const
-    {
-        return type == right.type && content == right.content && attributes == right.attributes;
-    }
-
-    bool isEmpty() const
-    {
-        return type == MessageComponentType::Other;
-    }
-};
-
 /**
  * @class MessageContentModel
  *