Some viewer-related fixes

[MrHell228]

Viewer#sendWorldType():

• DimensionType effects are contained in ClientLevel#effects so we need to modify it instead of modifying actual DimensionType
• Removed implements LevelBridge from ClientLevelMixin because LevelMixin already implements it

BookItemStackData:

• Don't know if we want to expose WrittenBookContent or keep current keys but for now I just made it working with current stuff

BookUtil:

• There is no more need to manually localize book content because it's done on client
• bookSlot was changed from inventory.items.size() + inventory.selected to inventory.selected and container id was changed from 0 to -2 because the only reason it works now is that (picture) size of red area (inventoryMenu indexing) luckily equals to size of blue area (inventory.items.size()). -2 stands for Player#inventory and first 9 items in it is hotbar