For the first cut, the file path is not configurable and the content
filter cannot be toggled on or off. If we fail to apply the content
filters for any reason (e.g. the filter file doesn't exist), we simply
just stop loading the content filters to allow using Ladybird without
content filters.
We use a ModelTranslator to expose a DOMTreeModel from LibWebView :^)
It allows you to select the currently inspected node, which causes
the engine to render a little box model overlay above the web content.
This will allow us to share code with LibWebView from SerenityOS.
(This would otherwise not work, since its "WebView" namespace collides
with our "WebView" class.)
Also, we should eventually move towards a more sophisticated
multi-process WebView like OOPWV.
