feat(StatusChatToolBar): add members and search button

This commit adds the members and search button which are needed for certain
features in Status Desktop. In views where these aren't needed, each button
can be set `visible: false` individually:

```qml
StatusChatToolBar {
    ...
    membersButton.visible: false
    searchButton.visible: false
}
```

Closes #243

ui/StatusQ/sandbox/DemoApp.qml

@@ -255,6 +255,8 @@ Rectangle {
                     chatInfoButton.type: StatusChatInfoButton.Type.OneToOneChat
                     chatInfoButton.pinnedMessagesCount: 1
 
+                    searchButton.visible: false
+                    membersButton.visible: false
                     notificationCount: 1
 
                     onNotificationButtonClicked: notificationCount = 0

ui/StatusQ/src/StatusQ/Components/StatusChatToolBar.qml

@@ -14,6 +14,8 @@ Rectangle {
     property alias chatInfoButton: statusChatInfoButton
     property alias menuButton: menuButton
     property alias notificationButton: notificationButton
+    property alias membersButton: membersButton
+    property alias searchButton: searchButton
     property int notificationCount: 0
 
     property Component popupMenu
@@ -21,6 +23,8 @@ Rectangle {
     signal chatInfoButtonClicked()
     signal menuButtonClicked()
     signal notificationButtonClicked()
+    signal membersButtonClicked()
+    signal searchButtonClicked()
 
     onPopupMenuChanged: {
         if (!!popupMenu) {
@@ -44,6 +48,24 @@ Rectangle {
 
         spacing: 8
 
+        StatusFlatRoundButton {
+            id: searchButton
+            width: 32
+            height: 32
+            icon.name: "search"
+            type: StatusFlatRoundButton.Type.Secondary
+            onClicked: statusChatToolBar.searchButtonClicked()
+        }
+
+        StatusFlatRoundButton {
+            id: membersButton
+            width: 32
+            height: 32
+            icon.name: "group-chat"
+            type: StatusFlatRoundButton.Type.Secondary
+            onClicked: statusChatToolBar.membersButtonClicked()
+        }
+
         StatusFlatRoundButton {
             id: menuButton
             width: 32
@@ -55,8 +77,17 @@ Rectangle {
             onClicked: {
                 statusChatToolBar.menuButtonClicked()
                 highlighted = true
-                let p = menuButton.mapToItem(statusChatToolBar, menuButton.x, menuButton.y)
-                popupMenuSlot.item.popup(p.x + menuButton.width - popupMenuSlot.item.width, p.y + 4 + menuButton.height)
+                popupMenuSlot.item.popup(-popupMenuSlot.item.width + menuButton.width, menuButton.height + 4)
+            }
+
+            Loader {
+                id: popupMenuSlot
+                active: !!statusChatToolBar.popupMenu
+                onLoaded: {
+                    popupMenuSlot.item.closeHandler = function () {
+                        menuButton.highlighted = false
+                    }
+                }
             }
         }
 
@@ -65,7 +96,8 @@ Rectangle {
             width: 1
             color: Theme.palette.directColor7
             anchors.verticalCenter: parent.verticalCenter
-            visible: menuButton.visible && notificationButton.visible
+            visible: notificationButton.visible &&
+                (menuButton.visible || membersButton.visible || searchButton.visible)
         }
 
         StatusFlatRoundButton {
@@ -103,15 +135,5 @@ Rectangle {
         }
 
     }
-
-    Loader {
-        id: popupMenuSlot
-        active: !!statusChatToolBar.popupMenu
-        onLoaded: {
-            popupMenuSlot.item.closeHandler = function () {
-                menuButton.highlighted = false
-            }
-        }
-    }
 }