Clean up g_log handling

Clean up the way g_log messages are handled and remove a bunch of unnecessary stuff.

I removed the glibtrace stuff as this should really be done via `G_DEBUG=fatal-warnings` and not be a compile time option.

Testing Done:
Ran locally and verified that additional messages were showing up in the terminal (for domains that weren't previously listed).

Reviewed at https://reviews.imfreedom.org/r/183/