Update the way Message Colorization, Text Components, etc. work

Checks

[x] /moducoredump command works without error
- If you push a change that breaks the dump command, it is hard to debug issues if people have them.

[x] Work away from adventure / MF message
[x] Work out how colorization and formatting will work in ChatEvent
[x] Work out how colorization and formatting will work in configurable messages (this can probably just use the adventure formats of Mini Message)
- Will use these rules. Configurable messages will use MiniMessage formats, <#...> and &#... for hex, but no Legacy Ampersand (&)
- User inputs will use the legacy serializer
- Chat will be legacy serializer
[ ] Check that #waitForEvent works with coroutines instead of a task
[ ] Check that the player chat event is working appropriately with plugin#launch
[x] Move HelpCommand stuff to adventure
[x] Make ${version} expand correctly
[ ] https://github.com/commonmark/commonmark-java can this be used with custom "HTML" tags to make minimessages from markdown
[ ] Allow configuration (maybe even per-user) on whether to prefer mini message or legacy

Resolve #87