Adds compatibility with ViaVersion and ViaBackwards 5.12.0

Other changes

• Fixed and improve sound mappings in 1.9->1.8. (Also thanks @Beaness)
• Fixed potion spawn's velocity not being applied in 1.9->1.8. (Thanks @Term4)
• Pass view-relative teleport flags through in 1.9->1.8. (Thanks @Term4)
• Fixed using an item in air packet not matching the old packet in 1.9->1.8. (Thanks @Beaness)
• Fixed splash potions turning into drinkable potions in 1.9->1.8. (Also thanks @Term4)
• Handle single player inventory slot updates in 1.9->1.8. (Also thanks @Term4 & @Beaness)
• Send server titles back to the client after cooldown visualization in 1.9->1.8. (Also thanks @Beaness)
• Queue teleport confirmation acks to match client behaviour in 1.9->1.8. (Thanks @Beaness)
• Fixed use animation cancelling upon status updates in 1.9->1.8. (Thanks @Term4)
• Fixed entity position format conversion rounding in 1.9->1.8. (Thanks @Term4)
• Fixed impl version not present in Via dumps.

Please also read the 4.1.3 changelog: https://github.com/ViaVersion/ViaRewind/releases/tag/4.1.3

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I'll continue improving this project to the best of my ability.