Generalize the GPU brush cache for reusable node data - #4526

Generalize the GPU brush cache for reusable node data#4526

YohYamasaki wants to merge 3 commits into

GraphiteEditor:masterGraphiteEditor/Graphite:masterfrom

YohYamasaki:extract-brush-cacheYohYamasaki/Graphite:extract-brush-cacheCopy head branch name to clipboard