- Enhancement: Allow 'a' also with meta key (command in Mac, ctrl otherwise)

to select all (part of #291)
- Enhancement: Add a global escape key listener to clear the selection
- Refactoring: Change 'a' to lower case in key command to avoid impression
  that shift is needed

svgedit-config-iife.js

@@ -33407,10 +33407,20 @@
           svgCanvas.cloneSelectedElements(10, 0);
         }
       }, {
-        key: 'A',
+        key: 'a',
         fn: function fn() {
           svgCanvas.selectAllInCurrentLayer();
         }
+      }, {
+        key: modKey + 'a',
+        fn: function fn() {
+          svgCanvas.selectAllInCurrentLayer();
+        }
+      }, {
+        key: ['esc', false, false],
+        fn: function fn() {
+          svgCanvas.clearSelection();
+        }
       }, // Standard shortcuts
       {
         key: modKey + 'z',