HaikuDepot: Log Process Report

To make it easier to understand what process
elements are taking a long time to run, a
small simple report is output as debug log
at completion of a process.

Change-Id: I09b93c494961e7abbbd22a3c58c64631f08025af
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7075
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

HaikuDepot: Fix Crash on Shutdown

The MainWindow itself was a BReferencable via a listener
virtual class. It looks like the error has come from a
conflict between the MainWindow's own deletion and the
state of the reference count. This change moves the
listener / BReferencable out of the MainWindow so that
the lifecycle of the BReferenable can be managed
correctly.

A further problem here is that the new listener
was leaked from the MainWindow class on shutdown.
To resolve this problem requires a considerable
change to the "process coordinator" system.

Fixes #17689

Change-Id: I7230843ba05537015f4a597b4a616b96c6db3dde
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5285
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Andrew Lindesay <apl@lindesay.co.nz>

HaikuDepot: Shutdown Handling

Improvements to the shutdown handling mechanics so that
if there is an install etc... happening when the
application is quit that it will wait until the process
is complete before actually terminating.

Change-Id: I8d3c4fbd9de0abc9382d55f0a6955b7f63a36637
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4322
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

HaikuDepot: Background Processing

Unify the background processing in the
application to one system and refactor
the package actions. This won't fix
any specific current issues with this
area, but lays the ground for later
fixes.

Change-Id: I098b81e7afc4aeb883bddf1acfc01f7888134257
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3997
Reviewed-by: Andrew Lindesay <apl@lindesay.co.nz>