Refactor routing code

src/routes/router_utils.nim

@@ -0,0 +1,11 @@
+import ../utils
+
+template cookiePrefs*(): untyped {.dirty.} =
+  getPrefs(request.cookies.getOrDefault("preferences"))
+
+template getPath*(): untyped {.dirty.} =
+  $(parseUri(request.path) ? filterParams(request.params))
+
+template refPath*(): untyped {.dirty.} =
+  if @"referer".len > 0: @"referer" else: "/"
+