change privileged accounts to gold accounts, add platinum accounts, add favorite and tag query limiting based on level

app/logical/anonymous_user.rb

@@ -133,7 +133,19 @@ class AnonymousUser
     :anonymous
   end
   
-  %w(member banned privileged contributor janitor moderator admin).each do |name|
+  def tag_query_limit
+    2
+  end
+  
+  def favorite_limit
+    0
+  end
+  
+  def favorite_count
+    0
+  end
+  
+  %w(member banned privileged platinum contributor janitor moderator admin).each do |name|
     define_method("is_#{name}?") do
       false
     end

app/logical/post_query_builder.rb

@@ -49,24 +49,24 @@ class PostQueryBuilder
       "''" + escaped_token + "''"
     end
   end
-  
+
   def add_tag_string_search_relation(tags, relation)
     tag_query_sql = []
 
     if tags[:include].any?
-      raise ::Post::SearchError.new("You cannot search for more than #{Danbooru.config.tag_query_limit} tags at a time") if tags[:include].size > Danbooru.config.tag_query_limit
+      raise ::Post::SearchError.new("You cannot search for more than #{CurrentUser.tag_query_limit} tags at a time") if tags[:include].size > CurrentUser.tag_query_limit
       tag_query_sql << "(" + escape_string_for_tsquery(tags[:include]).join(" | ") + ")"
       has_constraints!
     end
 
     if tags[:related].any?
-      raise ::Post::SearchError.new("You cannot search for more than #{Danbooru.config.tag_query_limit} tags at a time") if tags[:related].size > Danbooru.config.tag_query_limit
+      raise ::Post::SearchError.new("You cannot search for more than #{CurrentUser.tag_query_limit} tags at a time") if tags[:related].size > CurrentUser.tag_query_limit
       tag_query_sql << "(" + escape_string_for_tsquery(tags[:related]).join(" & ") + ")"
       has_constraints!
     end
 
     if tags[:exclude].any?
-      raise ::Post::SearchError.new("You cannot search for more than #{Danbooru.config.tag_query_limit} tags at a time") if tags[:exclude].size > Danbooru.config.tag_query_limit
+      raise ::Post::SearchError.new("You cannot search for more than #{CurrentUser.tag_query_limit} tags at a time") if tags[:exclude].size > CurrentUser.tag_query_limit
       raise ::Post::SearchError.new("You cannot search for only excluded tags") unless has_constraints?
 
       tag_query_sql << "!(" + escape_string_for_tsquery(tags[:exclude]).join(" | ") + ")"