Put TABS map control into its own module.
Break things out into modules
Fixup some missing and/or incorrect variables
Move trigonometric funcs to a module
add VectorFrameSource.withGridLocations
Be more responsive when stopping animation
Put private functions after everything else
MapView no longer needs API
Track the currentFrame on the mapView.
Set barb angle in degrees
Space bar pauses
Separate out frame drawing from looping animation
Be explicit about who's listening for spacebar
Somehow it's faster not to cache the layers
Optional logging of FPS to console
Add not to remove FPS logging when this is all over
Map is stopped by default (call .start())
Remove unused 'lines' array
Make sure we don't schedule the next frame until this one draws
Improve FPS calculation