Optimize Rendering Inner Loop

[themadcreator]

• Move concats out of inner loop for resolving attributes.
• Memoize AttrToProjector lookups.
• Increased bar count in canvas_bars quicktest to 100K to more easily see perf changes.
• Custom memoize cache implementation for faster 2D index lookup.

Initial local testing indicates 12 - 21% speedup in render.

[blueprint-bot]

Memoize AttrToProjector. Move concats out of inner loop.

Demo: quicktests | fiddle

[themadcreator]

Also added feature flag (default false) for this memoization

[blueprint-bot]

Merge remote-tracking branch 'origin/develop' into bd/memoize-accessor

Demo: quicktests | fiddle