Improved Spout/Sink System

[Xaymar]

Description

The current way of having audio or video being mirrored is not exactly bug free and comes with problems, such as left over scene references and other nonsense. A better way that allowed for improved support and rendering speed would be to have a Spout/Sink system.

A Spout would be added as either an Audio or Video filter to a source, upon which everything that happened before that filter becomes available to any Audio or Video sink. Due to the caching being performed by the origin instead of the target, a lot less CPU and GPU resources are required for bigger setups, and even more massive setups can be created which take advantage of this system.

Checklist:

• I have read the contribution guidelines.
• This feature is necessary and can't be done through other means.
• This feature does not break existing functionality.
• I am willing to hire/pay someone to implement this.

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