PropExprElements

[Absolutionism]

Problem

There is no way for addons to be able to use container objects, such as SkriptQueue, and to to be used in ExprElements.

Solution

Adds a property handler, ElementHandler, allowing to get elements from an object, with either a specific index or a range.
Adds a property, ELEMENTS, that is used on SkriptQueue
Adds a property handler, ReturnablePropertyHandler that pulls out 'returnType' and 'possibleReturnTypes' from 'ExpressionPropertyHandler'
'ExpressionPropertyHandler' and 'ElementHandler' extend 'ReturnablePropertyHandler'
Pulls out 'getPropertyReturnTypes' from 'PropertyBaseExpression' to 'PropertyBaseSyntax',
Adds an additional 'getPropertyReturnTypes' for a handler extending 'ReturnablePropertyHandler'

Adds PropExprElements that is a property version of ExprElements.

Testing Completed

quickTest

Supporting Information

N/A

Note
PR currently fails due to pattern conflicts from property syntax elements.
This PR will stay in draft until properties are officially released in 2.14

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Completes: none
Related: none

[sovdeeth]

Haven't looked at code, but I would like the property to be called ORDERED_ELEMENTS as some things could have elements without ordered access.

Actually maybe order implies sorting, idk. Something that makes it clear you can access elements by index.