Add visualisation of the account's third party IDs in the account editor.

A category won't be shown if there are no relevant IDs (will add the ability to add new ones later).

Part of network/neochat#565

![image](/uploads/7da00b0b4acf90d145c09969ac2a91e1/image.png)

src/neochatconnection.h

@@ -9,6 +9,8 @@
 #include <QCoroTask>
 #include <Quotient/connection.h>
 
+#include "models/threepidmodel.h"
+
 class LinkPreviewer;
 
 class NeoChatConnection : public Quotient::Connection
@@ -29,6 +31,11 @@ class NeoChatConnection : public Quotient::Connection
     Q_PROPERTY(QString deviceKey READ deviceKey CONSTANT)
     Q_PROPERTY(QString encryptionKey READ encryptionKey CONSTANT)
 
+    /**
+     * @brief The model with the account's 3PIDs.
+     */
+    Q_PROPERTY(ThreePIdModel *threePIdModel READ threePIdModel CONSTANT)
+
     /**
      * @brief The total number of notifications for all direct chats.
      */
@@ -96,6 +103,8 @@ public:
 
     Q_INVOKABLE void deactivateAccount(const QString &password);
 
+    ThreePIdModel *threePIdModel() const;
+
     /**
      * @brief Create new room for a group chat.
      */
@@ -167,6 +176,8 @@ private:
     bool m_isOnline = true;
     void setIsOnline(bool isOnline);
 
+    ThreePIdModel *m_threePIdModel;
+
     void connectSignals();
 
     int m_badgeNotificationCount = 0;