Visual fixes

• Updated shulker textures
• updated cherry boat item texture
• updated bamboo raft item texture
• updated chest boat textures
• updated chest boat item textures
• changed end crystal texture
• updated bamboo fence item model
• changed horse inventory saddle, horse armor and carpet textures
• updated horse and llama chest textures
• fixed mule texture

I plan on replacing all the images in the images tab soon.