`block equips <item>` (#2595)
* `<block> equips <item> (on <entity>)` event
* Add example
* Replace `on <entity>` with switch `on:<entity>`
* Change event line to not conflict with other events
* Remove `block` context, uncache `item`, and add determination
* Add example
* Add determination prefix
* Update meta
* Fix up some phrasing
i can't speak english :skull:
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commit: 83951fb)
