Shorter name for ol.Feature
Disallowing mixed geometry collections for now
Geometry type enumeration
Types for rings and mixed collections
Initial filter package, geometry type filtering only for now
Basic vector source and layer

The vector source maintains a cache of features.  These are indexed by geometry type in anticipation of the renderer's needs.
Skeleton canvas renderer for vector layer
Symbolizer literals will be cached by the renderer
Shorter name
Initial tests for filter