HaikuDepot : Fix Compile Warnings

Change-Id: I3f44eb33d26c1236de2b132a27ca3ad4ddb0bbc1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7298
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

HaikuDepot: Better Logging

Changes the logging in HD to use a macro for the
various log levels to declutter the code and to
make it easier to more systematically log.

Change-Id: I025970707a0a11e7e3aaa4b52fc91288af0183f5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3018
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

HaikuDepot: Improved logging control

The application had previously no means to control the verbosity of
logging. This excessive logging meant that it was bit hard to
understand what is going on. Now it is possible to define the level
of logging that is output; especially as the application pulls-down
data from the remote server system.