* src/client/components/client-web-view.vala (ClientWebView): Register
for new remoteImageLoadBlocked message from JS. Add new
::remote_image_load_blocked signal to notify when a remote image load
was blocked. Add ::allow_remote_image_loading and ::load_remote_images
methods to allow th app to manage image loading state.
* src/client/conversation-viewer/conversation-email.vala
(ConversationEmail): Determine up front whether the message view should
load remote images and flag that, rather than passing through the email
flag and the contact store.
* src/client/conversation-viewer/conversation-message.vala
(ConversationMessage): Rmeove contact_store and
always_load_remote_images properties and related code, just let the
parent email view advise whether remote images should be initially
loaded and act accordingly. Look up to ClientWebView signal and methods
to handle manual remote image loading management by the user. Remove
some obsolete code.
* src/client/web-process/web-process-extension.vala (GearyWebExtension):
Replace allow_prefix implementation for remote image management with
explicit signalling to/from the application via JavaScript.
* ui/client-web-view.js: Add a new PageState object, add props and method
to implement remote image loading management.
* ui/client-web-view-allow-remote-images.js: Monkeypatch to be used when
remote images should be loaded by default.
* ui/CMakeLists.txt: Include new JS file.
* src/client/conversation-viewer/conversation-web-view.vala,
src/client/web-process/util-conversation.vala,
src/client/web-process/util-webkit.vala: Remove obsolete code.
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