Proposal: `throttle`

[Martin-Pitt]

I think the throttles should be covered in the definitions. They are a penalty like energy or sleep which are also defined.

For example:

llDamage:
    throttle: ≤10 calls / 30 seconds / recipient
llHTTPRequest:
    throttle:
    - 25 requests / 20 seconds / object
    - 1000 requests / 20 seconds / owner
    - 5 HTTP errors (500 or higher) / 60 seconds / script
llTriggerSound:
    throttle: 22 sounds / second / object

So probably either a simple string or list of strings for multiple throttles.

RegionSayTo seems trickier since it depends on public channel / channel zero and the "thereafter" throttle that is activated after the first, so not sure how to convey that across.

llRegionSayTo:
    throttle: "Applies to Public Channel: 200 messages / 10 seconds / destination THEN 100 messages / 300 seconds / object"

There are also some cases where there are hidden throttles. In that case perhaps some safe guideline could be mentioned with a specifier it is a guideline.

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