Add generic QA error

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.

modules/behavior/hover.js

@@ -5,7 +5,7 @@ import {
     select as d3_select
 } from 'd3-selection';
 
-import { osmEntity, osmNote, krError, iOsmError } from '../osm';
+import { osmEntity, osmNote, krError, qaError } from '../osm';
 import { utilKeybinding, utilRebind } from '../util';
 
 
@@ -113,7 +113,7 @@ export function behaviorHover(context) {
                 selector = '.data' + datum.__featurehash__;
 
             } else if (
-                datum instanceof iOsmError ||
+                datum instanceof qaError ||
                 datum instanceof krError
             ) {
                 entity = datum;
@@ -187,4 +187,4 @@ export function behaviorHover(context) {
 
 
     return utilRebind(behavior, dispatch, 'on');
-}
+}