dtext: handle [bur:<id>] tags in main parser.

Move the parsing for the [bur:<id>], [ta:<id>], [ti:<id>] pseudo tags to
the main parser in `DText.format_text`. This fixes a bug where wiki
links inside bulk update requests on the forum weren't properly
colorized because the text of the BUR was embedded after we scanned for
wiki links, not before.

This also ensures that tags inside bulk update requests will be recorded
in the dtext_links table, meaning that forum posts can be properly
searched by tags.

This incidentally means that these request pseudo tags can now be used
outside the forum.

test/unit/d_text_test.rb

@@ -40,6 +40,16 @@ class DTextTest < ActiveSupport::TestCase
     end
 
     context "#format_text" do
+      setup do
+        CurrentUser.user = create(:user)
+        CurrentUser.ip_addr = "127.0.0.1"
+      end
+
+      teardown do
+        CurrentUser.user = nil
+        CurrentUser.ip_addr = nil
+      end
+
       should "add tag types to wiki links" do
         create(:tag, name: "bkub", category: Tag.categories.artist, post_count: 42)
         assert_match(/tag-type-#{Tag.categories.artist}/, DText.format_text("[[bkub]]"))
@@ -55,6 +65,16 @@ class DTextTest < ActiveSupport::TestCase
 
         refute_match(/dtext-tag-does-not-exist/, DText.format_text("[[help:nothing]]"))
       end
+
+      should "parse [ta:<id>], [ti:<id>], [bur:<id>] pseudo tags" do
+        @bur = create(:bulk_update_request)
+        @ti = create(:tag_implication)
+        @ta = create(:tag_alias)
+
+        assert_match(/bulk update request/, DText.format_text("[bur:#{@bur.id}]"))
+        assert_match(/implication ##{@ti.id}/, DText.format_text("[ti:#{@ti.id}]"))
+        assert_match(/alias ##{@ta.id}/, DText.format_text("[ta:#{@ta.id}]"))
+      end
     end
 
     context "#parse_wiki_titles" do