Sam 1f4ace4f56 FEATURE: autocomplete usernames early in topic based on participation
Following this change when a user hits `@` and is replying to a topic they
will see usernames of people who were last seen and participated in the topic

This is somewhat experimental, we may tweak this, or make it optional.

Also, a regression in a423a938 where hitting TAB would eat a post you were writing:

Eg this would eat a post:

``` text
@hello, testing 123 <tab>
```
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