server: Set no-argb env var

No reason to make use this in g-t by default, and argb's previously been the
cause of reports of unreasonably high memory use, and crashes.
Revert "server: Set no-argb env var"

This was reverted from gtk+ and therefore the env var doesn't do anything.

This reverts commit a62094edc6427051cf5d398e1566cddbfaaef049.
build: Check for the search provider interface definition file

Abort configure if the search provider is enabled but the interface
definition file isn't present, instead of succeeding configure but
aborting make later on.
build: generated files must be nodist
app: Add setting to disable shell integration

When the search provider is enabled at build time it can still
be disabled at runtime.
profile: Fix dummy settings patch

Fixes crash when cloning a profile.

https://retrace.fedoraproject.org/faf/problems/1433130/
https://bugzilla.gnome.org/show_bug.cgi?id=724264
accels: Add find items to accel editor

Also fix default accels.

https://bugzilla.gnome.org/show_bug.cgi?id=723758