Filters out errors not present in the data .json file to enable
selective support since Osmose has a wide variety of errors which may be
too advanced for iD.
Also added processing for the elements associated with an error for
forced visibility and highlighting.
I've converted the improveOSM errors to use this new generic QA error
structure which should allow for more general code to be used in
behaviour and UI.
Sidebar preview is currently broken, but will be fixed shortly.
