Make JS turtle graphics animate
Fix JS DOM timeouts
Fix flicker of JS turtle graphics
Jump to JS debugger for method on undefined
Compile types early now that methods are
Add atModuleEnd method to dialect protocol

Now, when a module in a dialect finishes loading the atModuleEnd method
of the dialect (if any) will be requested, passing in a reference to the
new module object. atModuleEnd may perform bookkeeping or launch desired
behaviours (like graphical rendering).
Use atModuleEnd in logo dialect
Make JS pong harder
Fix JS not recompiling when target changed.
Fix parser using wrong token kinds for object inheritance.