Garry's Mod JukeBox - YouTube Music Player

This update aims to address the video freezing issues. This is EXPERIMENTAL and may not work, please report which songs freeze and when so I can investigate further.

1. Changed the web-code to try and prevent YouTube videos freezing.
2. Added ServerGuard support to make people managers.
3. Added JukeBox.Settings.UseServerGuardRanks (default false)
4. Tells the JukeBox whether ServerGuard is installed.
5. Added JukeBox.Settings.ServerGuardRanksList (default list)
6. Tells the JukeBox which ServerGuard ranks are managers.
7. Added a max songs in All Songs list slider (default 200)
8. This defines how many songs can be displayed in the All Songs list at once to prevent crashing. Can be infinite still.
9. Altered the alert colour in the options menu to make the text more legible.

There have been changes to the shared_settings.lua and shared_language.lua files, so the file will have to be replaced. Make sure to carry over your settings/translations.