Implement Infrastructuro to reuse the previous evaluation of the
node graph to blend the new stroke with instead of drawing the
entire trace from scratch.
This does not transition to a blending based approach because that still
caused regressions but allows the brush node to work with input data
natively.
Test Plan:
- Use the brush tool in the editor and check for regressions
- Evaluate the performance
Reviewers: Keavon
Pull Request: https://github.com/GraphiteEditor/Graphite/pull/1190