Backporting 1.19.3-1.20 gamerules to the older versions.

Commands:

• /backportgamerule list displays a list of gamerules and their values
• /backportgamerule set <gamerule> <value> sets the value for a gamerule
• /backportgamerule version displays current version of the mod

Gamerules:

• blockExplosionDropDecay (default: true)
• mobExplosionDropDecay (default: true)
• tntExplosionDropDecay (default: false)
• snowAccumulationHeight (default: 1)
• snowLayersKillGrass (default: true)
• waterSourceConversion (default: true)
• lavaSourceConversion (default: false)
• globalSoundEvents (default: true)