This adds a 'is_fetchable()' method on the ProtocolHandler trait that is then used in the fetch code.
The 'data:' protocol handler is updated to return true instead of hardcoding the scheme comparison, as well
as the 'urlinfo:' handler since it's just a testing one.
Signed-off-by: webbeef <me@webbeef.org>
This implements a simple tab system for servoshell:
- The egui part uses the built-in SelectableLabels components and
display the full tab title on hover.
- WebView structs now hold all the state for each WebView. When we
need "global" state, we return the focused WebView state, eg.
for the load status since it's still global in the UI.
- New keyboard shortcut: [Cmd-or-Ctrl]+[W] to close the current tab.
- New keyboard shortcut: [Cmd-or-Ctrl]+[T] to create a new tab.
- The new tab content is loaded from the 'servo:newtab' url using a
couple of custom protocol handlers.
Signed-off-by: webbeef <me@webbeef.org>
