quiver: handle autoscaling with quiverkey when animated

Added a test. Closes #2616.
Merge pull request #2835 from efiring/quiver_animate

quiver: handle autoscaling with quiverkey when animated
Rotate markers in Scatter plot
Rename _CollectionWithRotations to _CollectionWithAngles
apply incrementaly the Affine2D transform for size and angle
use super for draw method
apply only once the scale and rotation
error in configuration off affine transform for ellipseCollection
correct the angle orientation to clock-wize