- Simplifies our code a little bit
- Quick to provide and gives us the `item` + `class` without requesting
all other information (the two things needed to know the error type)
- Removed handling of associated elements for now, need to implement
fetching for that data on a per-issue basis when the UI loads
- Set things up for the possibility of using the provided translation
strings (need to determine if desirable)
See: https://github.com/osm-fr/osmose-frontend/issues/193
Some error types don't require unique strings and can share common
strings among the category. This makes that possible as well as adding
support for some other types of error for demonstrative purposes.
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.
