More uniform exception logging helpers

[makyen]

This started out with just intending to add some additional debug logging of exception in the chat init sequence in order to be able to get a better idea of what was happening during that process when SE was down. However, prior to that, I made changes to the logging helper functions, log(), log_exception(), and log_current_exception() to have more descriptive argument names, more consistency, etc.

This PR does:

• More consistent argument name level -> log_level in log_exception and log_current_exception() to match log()
• More descriptive argument name in all three functions f->and_file to indicate the log is also being recorded in a file.
• Add ability to specify log_level and and_file for log_current_exception()`
• Use log_current_exception() for log_exception(*sys.exc_info()) throughout the code.
• Add ErrorLogs.add_current_exception
• Add debug level logging of exceptions which are caught in the chat room init process.

In addition to CI testing, a minimal amount of testing (basically just a smoke test) was performed in the Makyen Test 02 room.