Feature request: Better logging

[KelvinTegelaar]

Is your feature request related to a problem? Please describe.
The logging engine currently works by adding entries to a text file, using a mutex to prevent parallel write issues. This works OKish but could use some improvements.

I'd also like to have logs be in a better format. We currently use

DATE, USER, MESSAGE, SEVERITY

I am proposing changing this to:

DATE, USER, TENANT, MESSAGE, SEVERITY

Each API should post to the log without exception. Severity levels should be:

DEBUG
INFO
WARN
ERROR
CRITICAL

By default, the log should only return the INFO/WARN/ERROR levels, and have a selection option for the full log.

[KelvinTegelaar]

• Added more logging into components
• Added debug type logging
• Added log filtering in API

[KelvinTegelaar]

@redanthrax added logging to the graph function, with a critical level for any actual call failure.

[KelvinTegelaar]

And with the latest additions to the logging engine we can close this out. Logging interface can still use improvements, and that is planned in a new issue for 1.3