More routes for server
Add tests for InspectedPage.injectedScript and .preprocessingScript
Move Querypoint.InspectedPage to DevtoolsExtended.InspectedWindow
Break propertyEvent out of InspectedWindow for reuse
Code mixin() as private function, rename propertyEvent to mixinPropertyEvent to avoid dependency
Send the current inspectedWindow url to onURLChanged event on startup
Add InspectedWindow.onRuntimeChanged