Improve logger a bit

[Simon-Laux]

• omit stacktrace for debug and info
• move core event logs to their own log channel (makes event output smaller and less annoying)
• change logile extention to .log.tsv
• add colors, time elapsed and generally rework main process logging a bit:
  

[Simon-Laux]

[Jikstra]

Very helpful. You said that core events are now in their own channel, how can i still see them?

[Simon-Laux]

Very helpful. You said that core events are now in their own channel, how can i still see them?

With channel I mean channel of the logger. At the moment there is no filtering going on at all so all channels are displayed. We might develop a log reader that can filter the channels of the logfiles to make reading them easier.
At the moment the change is:
before:

main/deltachat DEBUG [] Core Event DC_EVENT_INFO  IMAP-IDLE SPAWNING

after:

core/event DEBUG [] DC_EVENT_INFO  IMAP-IDLE SPAWNING

after all changes:

3.2s [D]core/event: DC_EVENT_INFO  IMAP-IDLE SPAWNING