Make texts fields selectable by mouse for various components

This enables mouse-selectable for
- The image reader dialog
- Layer view text field (in simulation view)
- The TextField with unit component (for instace used to set the scale
 of models)
- Rename dialog(s)
- Currency text field
- The settings filter text field

CURA-8684

plugins/PerObjectSettingsTool/SettingPickDialog.qml

@@ -46,6 +46,7 @@ UM.Dialog
     TextField
     {
         id: filterInput
+        selectByMouse: true
 
         anchors
         {