big help upgrades

- short descriptions for command list
  - argument descriptions
  - render argument list on detailed help page

commands/message/search/youtube.js

@@ -30,6 +30,7 @@ module.exports = {
   aliases: ['yt'],
   metadata: {
     description: 'Returns search results from YouTube.',
+    description_short: 'YouTube Search',
     examples: ['youtube Google'],
     category: 'search',
     usage: 'youtube <query>'