DebugConsole must now be created from components

Remove the default console from UI.qml and add a utils.js function
to create one quickly.
Using this function from the component we actually want to debug gives
the console full access to that component's scope, children IDs, etc.

src/qml/utils.js

@@ -41,6 +41,11 @@ function makePopup(url, parent=null, properties={}, callback=null,
 }
 
 
+function debug(target, callback=null) {
+    return Utils.makeObject("DebugConsole.qml", target, { target }, callback)
+}
+
+
 function isEmptyObject(obj) {
     return Object.entries(obj).length === 0 && obj.constructor === Object
 }