Add defaults for class and item creation

[ECWireless]

• We should allow GameMasters / game creators to pick from a catalogue of defaults when creating items and classes
• These defaults would be the classes and items that RaidGuild uses
• Even after selecting the default, though, the user should still be able to make edits
  • For instance, if they select the default Warrior class, they should be able to change the name and description, while still keeping the class image