autocomplete: move artist/pool/wiki autocompletion to autocomplete.js.

* Move all autocomplete code to autocomplete.js.

* Mark autocompleted fields with `data-autocomplete="<type>"` attributes,
  instead of hardcoding input field IDs in the javascript.

app/assets/javascripts/artists.js

@@ -5,10 +5,6 @@
     if ($("#c-artists").length) {
       Danbooru.Artist.initialize_check_name();
       Danbooru.Artist.initialize_shortcuts();
-
-      if (Danbooru.meta("enable-auto-complete") === "true") {
-        Danbooru.Artist.initialize_autocomplete();
-      }
     }
   }
 
@@ -43,46 +39,8 @@
       });
     }
   };
-
-  Danbooru.Artist.initialize_autocomplete = function() {
-    var $fields = $("#search_name,#quick_search_name");
-
-    $fields.autocomplete({
-      minLength: 1,
-      source: function(req, resp) {
-        $.ajax({
-          url: "/artists.json",
-          data: {
-            "search[name]": req.term + "*",
-            "search[is_active]": true,
-            "search[order]": "post_count",
-            "limit": 10
-          },
-          method: "get",
-          success: function(data) {
-            resp($.map(data, function(artist) {
-              return {
-                label: artist.name.replace(/_/g, " "),
-                value: artist.name
-              };
-            }));
-          }
-        });
-      }
-    });
-
-    var render_artist = function(list, artist) {
-      var $link = $("<a/>").addClass("tag-type-1").text(artist.label);
-      return $("<li/>").data("item.autocomplete", artist).append($link).appendTo(list);
-    };
-
-    $fields.each(function(i, field) {
-      $(field).data("uiAutocomplete")._renderItem = render_artist;
-    });
-  }
 })();
 
-
 $(document).ready(function() {
   Danbooru.Artist.initialize_all();
 });