Rework ActionsHandler

Rework ActionsHandler as static helper functions.

The functions are now invoked from ChatBarCache so there is no need to pass an actions handler object around qml simplifying the code.

src/timeline/Bubble.qml

@@ -51,14 +51,6 @@ QQC2.Control {
      */
     required property var contentModel
 
-    /**
-     * @brief The ActionsHandler object to use.
-     *
-     * This is expected to have the correct room set otherwise messages will be sent
-     * to the wrong room.
-     */
-    property ActionsHandler actionsHandler
-
     /**
      * @brief Whether the bubble background should be shown.
      */
@@ -107,7 +99,6 @@ QQC2.Control {
                 delegate: MessageComponentChooser {
                     room: root.room
                     index: root.index
-                    actionsHandler: root.actionsHandler
                     timeline: root.timeline
                     maxContentWidth: root.maxContentWidth