Engine:

Audio nodes

• audio/file: add callbacks when calling .play() to track potential raised error
• audio/file: improve buffer current time display and buttons to play/pause and move forward/backward

COP nodes

• cop/audioAnalyser: fix speed channel

GL nodes

• ensures that gl/varyingWrite and gl/varyingRead work for all mesh materials, as well as point and line.
• add doc to many gl nodes.

SOP nodes

• sop/circle: add center param
• sop/transformReset: add operation
• sop/reflector and sop/oceanPlane: fix bug where an object not centered on the origin would have incorrect reflections
• sop/particlesSystemGpu: fix bug where texture allocation was not properly done.
• sop/particlesSystemGpu: fix bug where the shader was not always refreshed when adding/removing/updating param, texture, ramp and attribute nodes. This also applies to material builders and cop/builder.
• sop/particlesSystemGpu: fix bug where the particle material would not correctly read an attribute that was used in the particle sim, even if not updated by it.
• sop/color: fix bug where it would silently error if requested attribute was not found.

Shadows

• distance and depth custom shaders work for mesh, points and line, allowing shadows from spotlights, pointlights and directionalLights for material builders

Expressions

• ch: make 2nd argument optional. So only ch(<path to copy node>) is necessary
• strSub: first argument is converted to a string if it is another type

Plugins

• add .onBeforeDeleted to node lifecycle hooks