Compositing nodes

[BrendanParmer]

Features

• Compositor Nodes!
  • New UI for Compositor Nodes
  • Full tree copying, input initialization, linking, etc
  • In add-on mode, Compositor Nodes copy over the current scene and recreate the node tree there
• Added support for missing shader nodes (World, Line Style, Lights)
• Utility functions for converting 1D and 2D vectors and mathutil.Colors to Python strings
• Added support for CurveMaps with more than two default points

Fixes

• Typo in Material menu bl_idname

Refactor
Cleaned up a lot of code in order to make adding compositing nodes as seamless and consistent as possible. Most notably:

• Node settings now store the "type" of each setting (ST), so NTP no longer infers how it should be encoded in the generated code
• Color ramp, curve mapping, images, and image user logic has been moved to be handled like other node settings
• Introduced "special variables" which are hard set and should not be used for generated variable names, like for nodes, node trees, etc.

Style

• Class name changes for consistency
• Better type hinting for functions and some important variables
• Better function descriptions
• Nodes without settings are included in the settings dictionary