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Our templates have moved away from this, and we can remove it from our
sources too.

Instead of controlling the transfer manager at the IdeContext
level, this uses IdeApplication as the owning instance. This is
useful because it allows us to use it from preferences without
having a context accessible.

As the project has grown, we've let things get a bit out of their
logical place. This does a bit of cleanup and tries to bring some
of the embedded resources closer to where they are used.

But more importantly, this allows us to clean some things up to
the point that we can move forward statically linking a bunch of
the plugins into libide. The plan here is to speed up the initial
loading by avoiding lots of disk I/O stats which are currently
hurting us.

The html-preview plugin was creating lambda's which held
references to the various widgetry. These are apparently causing
leaks. Probably something to be worked out in PyGObject but
easier for us to just stop using lambda's when possible.

This adds an ctrl+alt+p shortcut like we used to have a long
time ago. However, due to a bug in the shortcut controller
dispatch in libdazzle, it does not current activate unless it
is set to global (which we do not want).

We'll have fixes coming to libdazzle shortly.

Additionally, it would be nice to register the command with
the shortcut manager so that we can get automated UI in the
shortcuts window, but we need to figure out how to do that
from Python first.

Straightforward port to the new Editor and Layout API

When asking a preview from .rst file, we walk back in the file tree
to search for a conf.py sphinx config file.
(the limits are ten level up or the project tree basedir)

the results of sphinx-build commands are keeped around
for each basedir in the tmp folder in gnome-builder-sphinx-build-XXXXXX
like folders (so we can update it after each key strokes or
triggering another preview with the same basedir)

To make it work, you need to have
python3-docutils installed

This uses our proper translation domain for all our use of
gettext in python plugins.

Now that we can merge menus, just use that instead of manually extending
the menu. Use action:enabled instead of hiding the menu item. I'd rather
we hide the menu item, maybe there is an attribute/hint for that...

Until the bug is fixed upstream, keep this disabled.

This moves the WebKit2 dependency into a plugin, allowing us to
drop it from the core binary.