Replace `for key in ...` with `for entity in ...`

[Masterchef365]

Query results used to have "keys" instead of entity IDs, now they don't. But this artifact is left behind and it's a little misleading. Fix me!

[MrKangs]

Do you want someone to update the syntax of all the example plugins from the word "key" to "entity" or something similar that is not misleading? What are some other changes you are looking at for this issue particularly?

[Masterchef365]

Do you want someone to update the syntax of all the example plugins from the word "key" to "entity"

ye

[Masterchef365]

Resolved by #55