The main motivator here was noticing that --disable-sql-database did not
work with AppKit. Rather than re-implementing this there, move ownership
of these classes to WebView::Application, so that each UI does not need
to individually worry about it.
Currently, if we want to add a new e.g. WebContent command line option,
we have to add it to all of Qt, AppKit, and headless-browser. (Or worse,
we only add it to one of these, and we have feature disparity).
To prevent this, this moves command line flags to WebView::Application.
The flags are assigned to ChromeOptions and WebContentOptions structs.
Each chrome can still add its platform-specific options; for example,
the Qt chrome has a flag to enable Qt networking.
There should be no behavior change here, other than that AppKit will now
support command line flags that were previously only supported by Qt.
Previously, the browser would crash when opening a task manager window
with the `--enable-qt-networking` flag set because we were passing the
default WebContentOptions to the underlying WebContentView.
This is the same behavior as RequestServer, with the added benefit that
we know how to gracefully reconnect ImageDecoder to all WebContent
processes on restart.
The location bar URL is no longer hidden when creating a new tab or
opening a new window that has an associated URL. Conversely, the
location bar is now always focused and the URL hidden when creating a
window or tab without an associated URL.
The location bar is focused when:
* Opening the browser from the command line with no URL arguments
* Opening a new tab (Ctrl+T)
* Opening a new window (Ctrl+N)
The location bar is not focused when:
* Opening the browser from the command line with one or more URLs
* Opening hyperlinks in a new tab
* Clicking a hyperlink with `target="_blank"`
This matches the behavior of other major browsers.
