Add keyboard shortcuts for empty cards and toggle mask on image occlusion (#3136)

* Add keyboard shortcuts for empty cards and toggle mask on image occlusion

- add shortcut for empty cards
- add shortcut for toggle mask
- set tooltips with shortcuts

use unused shortcut for empty cards

* remove unnecessary shortcut added in main.py

* change empty cards shortcut and try to fix CI error in CONTRIBUTORS

* change shortcut for empty cards for universal support

qt/aqt/forms/main.ui

@@ -213,6 +213,9 @@
    <property name="text">
     <string>qt_misc_empty_cards</string>
    </property>
+   <property name="shortcut">
+     <string notr="true">Ctrl+Alt+E</string>
+   </property>
   </action>
   <action name="actionCreateFiltered">
    <property name="text">

ts/editor/editor-toolbar/ImageOcclusionButton.svelte

@@ -14,12 +14,14 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     import DynamicallySlottable from "$lib/components/DynamicallySlottable.svelte";
     import Icon from "$lib/components/Icon.svelte";
     import IconButton from "$lib/components/IconButton.svelte";
+    import Shortcut from "$lib/components/Shortcut.svelte";
     import { mdiTableRefresh, mdiViewDashboard } from "$lib/components/icons";
 
     import {
         ioImageLoadedStore,
         ioMaskEditorVisible,
     } from "../../routes/image-occlusion/store";
+    import { toggleMaskEditorKeyCombination } from "../../routes/image-occlusion/tools/shortcuts";
 
     export let api = {};
 </script>
@@ -39,10 +41,16 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
                 on:click={() => {
                     $ioMaskEditorVisible = !$ioMaskEditorVisible;
                 }}
-                tooltip={tr.editingImageOcclusionToggleMaskEditor()}
+                tooltip="{tr.editingImageOcclusionToggleMaskEditor()} ({toggleMaskEditorKeyCombination})"
             >
                 <Icon icon={mdiViewDashboard} />
             </IconButton>
+            <Shortcut
+                keyCombination={toggleMaskEditorKeyCombination}
+                on:action={() => {
+                    $ioMaskEditorVisible = !$ioMaskEditorVisible;
+                }}
+            />
         </ButtonGroupItem>
         <ButtonGroupItem>
             <IconButton

ts/routes/image-occlusion/tools/shortcuts.ts

@@ -24,3 +24,4 @@ export const alignRightKeyCombination = "Shift+R";
 export const alignTopKeyCombination = "Shift+T";
 export const alignVerticalCenterKeyCombination = "Shift+V";
 export const alignBottomKeyCombination = "Shift+B";
+export const toggleMaskEditorKeyCombination = "Control+Shift+M";