[WIP] Extract mail log parsers into dedicated handler classes

[discordier]

Description

This cleans up the traffic parser classes.

This PR is currently just a preview (hence marked as WIP and none of the boxes below checked despite having added unit tests).

The TrafficCron is a big bunch of code and the mail log parser etc. are as well. As discussed on IRC, I started restructuring them into smaller classes that are more easy to track.

Type of change

• [X] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Includes unit tests for:

• [X] postfix log parsing
• [X] dovecot log parsing

Checklist:

• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

[d00p]

is this still being worked on?

[d00p]

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