* bindings/vapi/javascriptcore-4.0.vapi: Add some methods to
GlobalContext for accessing JSValues as ints.
* src/client/components/client-web-view.vala
(ClientWebView): Hook up UserContentManager script messages handler and
handler implementation for "preferredHeightChanged", update the new
preferred_height prop on the class, and queue a resize. Hook those
values up to the GTK allocation machinery.
(ClientWebView::get_int_result): Convenience method for getting an int
from a JavascriptResult.
(ClientWebView::get_preferred_height): Report back values as reported
by messages from the script handler.
(ClientWebView::register_message_handler): Convenience method for
registering script messages handlers.
* src/client/conversation-viewer/conversation-web-view.vala
(ConversationWebView): Remove now-redundant GTK allocation machinery.
* ui/client-web-view.js: Post a message to preferredHeightChanged when
the page is sorta-kinda loaded.
This gives us a means of using JS objects returned by UserContentManager
script messages directly from Vala.
* bindings/metadata/WebKit2-4.0.metadata: Tweak standard webkit2 VAPI to
re-include methods that return javascriptcore objects.
* bindings/vapi/javascriptcore-4.0.vapi: Copy generated VAPI file into
the tree, customise it so that it actually works.
* src/CMakeLists.txt: Generate the custom webkit2 VAPI, depend on
javascriptcore and include in-tree javascriptcore VAPI in the client
build.
* bindings/metadata/JSCore-3.0.metadata: Remove obsolete file.
