Add support for global keyboard shortcuts (#3493)

* changes for global keyboardshortcuts

* add keyboard.js startup module

* remove not existing "th-opening-window" hook

* correct title

* use utils.addEventListeners

* define platform lookup-names on startup

* use the startup-lookup-names array

* use the platform-specific lookupNames only

* Update keyboard.js

* move initializations to the constructor

* move initializations to the constructor

* rename hasAnyTiddlerChanged

* don't explicitely create new RegExp

* use $tw.utils.hopArray

* match strings, no regex

* remove hopArray, move to boot.js

* add $tw.utils.hopArray to boot.js

* style update

* style updates

* move more to keyboardManager module

this could probably be moved to rootwidget.js

* move more to keyboardManager module

* add event listener for shortcuts in new windows

* prevent error when opening window is blocked

* add keydown listener on document in startup.js

* delete startup/keyboard.js

* add missing this.shortcutTiddlers

* Update keyboard.js

* Update boot.js

* add exports.hopArray to utils.js

* minor codingstyle tweak

* change how lookupnames get pushed to array

* Update windows.js

* re-add shortcuts-listener for new windows

I removed this before which I think was because I misunderstood what exactly should go to a separate PR

core/modules/startup/startup.js

@@ -87,6 +87,14 @@ exports.startup = function() {
 	});
 	// Kick off the keyboard manager
 	$tw.keyboardManager = new $tw.KeyboardManager();
+	// Listen for shortcuts
+	if($tw.browser) {
+		$tw.utils.addEventListeners(document,[{
+			name: "keydown",
+			handlerObject: $tw.keyboardManager,
+			handlerMethod: "handleKeydownEvent"
+		}]);
+	}
 	// Create a root widget for attaching event handlers. By using it as the parentWidget for another widget tree, one can reuse the event handlers
 	$tw.rootWidget = new widget.widget({
 		type: "widget",