[WO-188][WO-421] introduce password-based login

* add custom login ability
* encrypt email password
* allow arbitrary tcp connections
* add db migration script v3 -> v4
* add bug reporting capability with the axe logger
* fix nonexistent folder handling
* enable message upload after sent
* use plain text alternative body when replying to html mails
* Move set-credentials.* -> login-set-credentials.*
* Use login styles for set-credentials
* Make OAuth optional
Say no to drugs
Merge pull request #94 from whiteout-io/dev/WO-421

Dev/wo 421