refactor all modals and popouts so they retain animations on exit

Common/ModalManager.qml

@@ -0,0 +1,14 @@
+import QtQuick
+pragma Singleton
+
+QtObject {
+    id: modalManager
+    
+    signal closeAllModalsExcept(var excludedModal)
+    
+    function openModal(modal) {
+        if (!modal.allowStacking) {
+            closeAllModalsExcept(modal)
+        }
+    }
+}