This change adds a missing attributes option for BaseView, and

updates several static attributes to let them work as functions (as

allowed by Backbone).
The static functions have access to this, since they're copied to the

prototype at class construction time and executed on the instance.
Unnecessary declarations for some instance-level types have been

removed.
New ElementAttributes and EventsHash types have been added and

exported. These allow easier reference without using Backbone.
Unit tests have been added to test all the static attribute/function

behavior during class construction and usage, render/visibility-related

methods, and all event management functions.

Unit tests pass.