Selectable motion clouds

[RoboDoig]

Motion cloud textures will be selected from a list that is pre-loaded in TextureResources. Right now one must manually select the BindTexture source for the motion clouds. Would be good if the schema allowed named reference to the motion cloud texture selected on each block.

[ederancz]

This is part of the new contract.

[RoboDoig]

Note for me, check ranson-rig implementation for texture loading

[RoboDoig]

A related issue that will fall under this new implementation - currently the workflow assumes a hard-coded number of frames for each motion cloud. This value is used to 'wrap' the motion cloud sequence back around to the start during phase procession. The wrap value should be determined automatically or added as a parameter in the session settings. Ideally automatically.

[RoboDoig]

I've implemented the ability to select motion cloud textures by name in the schema and updated the local version of the Bonsai shaders package to allow automatic wrapping see here for longer term support for this feature.

There is still an error on the first motion cloud that is loaded, I think because I've implemented the GetTextureData operator as a source with the texture name as a parameter, somehow the initialisation order means that it tries to access the texture before the name property is updated.

[RoboDoig]

@EleonoraAmbrad - please see PR #85 for implementation of this. Seems to work but if you have a chance to test on one of your motion cloud experiments that would be great!