Model items Converters

[natan-sinigaglia]

When defining item models (eg. timeline track items like Constant clip, LiveValueClip,...) we can also define operations to convert items between different composition types. example: take a clip from a timeline track and drag it to a matrix slot > it should create a matrix block, with the same Layer settings. potentially it could also connect the same Layer/composition in the patch (creating a link to the pin created by the new item in the new composition node)

Since these converters are trans-composition operators, they can't defined inside the Timeline vl doc or the Matrix doc. There can be a dedicated document for these, maybe called editor. they would be defined there and registered as services