Introduce fancy particle effects. Contributes to #261

Add user setting. Introduce FancyEffectsContainer. And confetti and snow
implementation.

imports/NeoChat/Page/RoomPage.qml

@@ -595,6 +595,14 @@ Kirigami.ScrollablePage {
         Layout.fillWidth: true
     }
 
+    FancyEffectsContainer {
+        id: fancyEffectsContainer
+
+        Layout.fillWidth: true
+        Layout.fillHeight: true
+        enabled: Config.showFancyEffects
+    }
+
     Kirigami.Theme.colorSet: Kirigami.Theme.View
 
     function goToEvent(eventID) {

imports/NeoChat/Page/SettingsPage.qml

@@ -70,5 +70,14 @@ Kirigami.ScrollablePage {
                 Config.save()
             }
         }
+        QQC2.CheckBox {
+            Kirigami.FormData.label: i18n("Timeline:")
+            text: i18n("Show Fancy Effects")
+            checked: Config.showFancyEffects
+            onToggled: {
+                Config.showFancyEffects = checked
+                Config.save()
+            }
+        }
     }
 }