Refactor of EntityChatData constructor (no need for playerName anymore). Fixed a bug which broadcasts death messages for any mob with a customName (now it must also have a character sheet)

Fixing another regression found during testing, user messages were breaking due to missing "playerName" attribute

Large refactor of EntityChatData, EntityChatDataLight, and ChatDataManager. Separating these into smaller, individual files, to make it easier to maintain.

- Added player face to player chat bubbles
- Added placeholder player text-top UI graphic (no friendship)
- Reduced ticks visible per page of player messages
- Changed PlayerMessage to extend EntityChatData, for simplicity

- Added additional truncate logic, to ensure all messages are limited to 512 characters
- Added new PlayerMessageManager to keep track of currently visible player messages, to soon be displayed temporarily