Expand Store

I love the store - it enables us as streamers to give something back to our viewers.

The problem is, it is very limited at the moment, so I suggest these changes to the store:
* Allow us to set a custom !buy <item> command, instead of 1, 2 etc.

* Allow us to limit a reward to a certain amount

* Allow us to limit rewards to a certain type (eg. regulars/subs etc.)

* Allow us to allow custom text when people buy an item eg. !buy <item> <message>
* Allow us to attach an image to the store item

* Give us an overlay option, so we can show when something is bought in the store (displaying the image attached if any)
* I would like to be able to sort the purchases in the store

Thanks for reading - upvote!