New Nodes

• add gl/checkers
• add gl/grid

Improvements

• builderMaterials can override which customMaterials they create.

The following change improve the git diff: - move selection as part of uiData - export shaders out of persisted_config, so that shaders are not a single line in the .json files

Bug Fix

• fix bug where unlocking and locking a polyNode would not update downstream node correctly