Add ability to do inline commands

[treetrnk]

Inline commands allow @ mentions of the bot from a conversation that the bot is not part of. Enabling this will allow you to roll dice from any conversation you are in via commands such as @rollembot /roll 4df+3.

[SimobiSirOP]

This would be cool. I actually dislike python, so i won't do pull requests, but will make comment to notify the owner