Removed unnecessary code, added metrics (bStats)

• Added some methods for potential compatibility in the future.
• Removal of unnecessary codes
• Add Metrics bStats (can be disabled)
• Added a function to see if TextComponent-related features are usable

NOTE :

If you want to use "display" method, please take a look to :

• https://minecraft.gamepedia.com/Tutorials/Command_NBT_tags#Items
• https://minecraft.gamepedia.com/Commands#Raw_JSON_text