Fix for some elements of canvas not getting refreshed after loading a save

This reverts merge request !2932

Fixed issue with filters

* Fixed error that could happen on layers with certain processing setups (like masking without recoloring)
* Unified system for layer processing steps
* Renderer performance is logged to Perflog

* Error reporting button not hidden during intro

Added "V" and "T" aliases for "State.variables" and "State.temporary", accessible in any script, and replaced most of the usages

  - small button in sidebar to display errors
  - copy all errors at once
  - limit of 100 errors
* Renderer errors that happen in callbacks not captured by SugarCube are logged
* 'Refresh caches' button in renderer debugger
* Split canvasmodel-utils.js from canvasmodel.js, making latter handle only CanvasModel code