Add ability to use arrows and Function keys for shortcuts (Fixes: #532) (#534)

* Add ability to use arrows for shortcuts
* Add support for function keys

options.js

@@ -31,6 +31,10 @@ var keyCodeAliases = {
   null: 'null',
   undefined: 'null',
   32: 'Space',
+  37: 'Left',
+  38: 'Up',
+  39: 'Right',
+  40: 'Down',
   96: 'Num 0',
   97: 'Num 1',
   98: 'Num 2',
@@ -46,6 +50,18 @@ var keyCodeAliases = {
   109: 'Num -',
   110: 'Num .',
   111: 'Num /',
+  112: 'F1',
+  113: 'F2',
+  114: 'F3',
+  115: 'F4',
+  116: 'F5',
+  117: 'F6',
+  118: 'F7',
+  119: 'F8',
+  120: 'F9',
+  121: 'F10',
+  122: 'F11',
+  123: 'F12',
   186: ';',
   188: '<',
   189: '-',