* src/client/composer/composer-link-popover.vala: New GtkPopover subclass
for creating/editing links.
* src/client/composer/composer-web-view.vala (EditContext): Add is_link
and link_uri properties, decode them from the message string, add
decoding tests.
(ComposerWebView): Add some as-yet un-implemented methods for
inserting/deleting links.
* src/client/composer/composer-widget.vala (ComposerWidget): Add
cursor_url for storing current text cursor link, update it from the
cursor_context_changed signal param, rename hover_url to pointer_url to
match. Add link_activated signal to let user's open links they are
adding, hook that up in the controller. Rename
::update_selection_actions to ::update_cursor_actions, since that's a
little more apt now, also enable insert link action if there is a
cursor_url set as well as a selection. Remove ::link_dialog, replace
with ::new_link_popover, hook up the new popover's signals there as
appropriate.
(ComposerWidget::on_insert_link): Create and show a lin popover instead
of a dialog.
* ui/composer-web-view.js: Take note of whther the context node is a link
and if so, also it's href. Include both when serialsing for the
cursorContextChanged message. Add serialisation tests.
* ui/composer-link-popover.ui: New UI for link popover.
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