Reorganize validation code

Rename IssueManager to coreValidator
Rename disconnected highway to disconnected way
Rename highway almost junction to almost junction
Rename mapcss checks to maprules
Rename deprecated tags to deprecated tag

modules/ui/commit_warnings.js

@@ -13,7 +13,7 @@ export function uiCommitWarnings(context) {
 
     function commitWarnings(selection) {
 
-        var issues = context.issueManager().getIssues();
+        var issues = context.validator().getIssues();
 
         issues = _reduce(issues, function(issues, val) {
             var severity = val.severity;