Add basic activity stats to template data

Include a few more activity stats/info to template data so mods can add more context to comments/notes/etc...

- votes
- number of reports (breakdown total/mods/user)
- age
- nsfw
- spoiler
- upvote ratio

Example usage:

```yaml
- kind: ban
  reason: 'Recieved {{item.votes}} in 10 minutes'
```