Adding a modified version of the `azurekinect` plugin: `azurekinectmulti`

[StrikeAgainst]

I will be adding another SSI plugin which is a modification of the azurekinect plugin originally by Fabian Wildgrube. I modified this plugin to have Azure Kinect point clouds working appropriately in the scope of my master thesis, "Development of an Affective Computing System for Networked Music Performance in Mixed Reality".

The modifications in this plugin include:

• More efficient network transmission by using the UDP protocol
• Simple masking capabilities
• Transmission rate compensation

-- Alexander Dauber