Logging: More refactors

Logging: More refactors

1. Merges the log and debug modules. I think their separation was the
   reason why they forgot to add stack traces to syslog when they added
   syslog to the project.
   Not risking that mistake again.
2. Removes as many obstacles as possible from stack trace printing on
   critical errors.
3. Add mutexes to logging. This should prevent messages from mixing on
   top of each other when there are threads.