Add nascent version of the mod detail page

* Create a nascent version of the mod detail page
* Make the slug mandatory for Mod instead of name, and load the name
  from the data file
* Make the Feedback view universal on all pages
* Refactor the use of mod pack to have a single global object at the
  router level which is shared between pages. Further, make this one
  object load itself immediately and have it automatically load any
  activated mod version
* Refactor the use of Storage related to mod pack versions into the
  router as well.
* Add trace logging back in for events, but allow individual classes
  to suppress it (as opposed to actually supressing the events)
* Fix a bug in ModVersion.eachItem where it would suggest so-called
  items which are merely registered slugs without associated items

scripts/server

@@ -22,6 +22,11 @@ app.get '/item(/*)?', (request, response)->
     response.set 'Content-Type', 'text/html'
     response.sendFile 'index.html', root:ROOT
 
+app.get '/mod(/*)?', (request, response)->
+    console.log ">>> index.html (for #{request.path})"
+    response.set 'Content-Type', 'text/html'
+    response.sendFile 'index.html', root:ROOT
+
 app.get '*', (request, response)->
     extension = path.extname(request.path)
     contentType = {