Changes:
- made it possible join with @ and # prepended as well
- Also made it possible if it's written in a singular string ie `@team#channel`
- also made this work with auto complete
- doesn't bug out if you do `/j @person` (with a space at the end) (which it
previously thought was a team + channel, with empty channel name
- Created new file colors.go
- Added color options to the UserConfig
- Possible to disable colors (in UserConfig)
- Fixed a bug where the login screen says `/j` and not `{cmdChar}j`
- Changed how attachments look - so it's clear it isn't just a message
saying that
- Changed how formatOutput works (to be more DRY)
- Colored unread messages
Changes to be committed:
new file: colors.go
modified: main.go
modified: userConfigs.go