Change ScatterEvent format to include flow and rotation data
Add a test for BrushTipMover writing to ScatterEvent
Restore Rasterizer sanity test
Initialize shared test contexts only just before tests are run
Add random rotation support to BrushTipMover
JSDoc correction for createScatterEvent
Take short segments into account even when not filling them
Add scatter offset to BrushTipMover
Improve non-continuous brush support
Initialize target values when resetting brush tip
Add utilities for calculating angles