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/wiki_pages.js

@@ -3,52 +3,10 @@
 
   Danbooru.WikiPage.initialize_all = function() {
     if ($("#c-wiki-pages,#c-wiki-page-versions").length) {
-      if (Danbooru.meta("enable-auto-complete") === "true") {
-        this.initialize_autocomplete();
-      }
-
       this.initialize_shortcuts();
     }
   }
 
-  Danbooru.WikiPage.initialize_autocomplete = function() {
-    var $fields = $("#search_title,#quick_search_title");
-
-    $fields.autocomplete({
-      minLength: 1,
-      source: function(req, resp) {
-        $.ajax({
-          url: "/wiki_pages.json",
-          data: {
-            "search[title]": req.term + "*",
-            "search[hide_deleted]": "Yes",
-            "search[order]": "post_count",
-            "limit": 10
-          },
-          method: "get",
-          success: function(data) {
-            resp($.map(data, function(wiki_page) {
-              return {
-                label: wiki_page.title.replace(/_/g, " "),
-                value: wiki_page.title,
-                category: wiki_page.category_name
-              };
-            }));
-          }
-        });
-      }
-    });
-
-    var render_wiki_page = function(list, wiki_page) {
-      var $link = $("<a/>").addClass("tag-type-" + wiki_page.category).text(wiki_page.label);
-      return $("<li/>").data("item.autocomplete", wiki_page).append($link).appendTo(list);
-    };
-
-    $fields.each(function(i, field) {
-      $(field).data("uiAutocomplete")._renderItem = render_wiki_page;
-    });
-  }
-
   Danbooru.WikiPage.initialize_shortcuts = function() {
     if ($("#a-show").length) {
       Danbooru.keydown("e", "edit", function(e) {