Add some gametests

[altrisi]

See existing ones to see how they work. Information about useful commands can be found in #320.

Also would be nice to add tests that the rules don't do anything if they're off, but that's for later.

Rules done (some likely can't be easily done as gametests, which is fine):

• [ ] autoCraftingDropper
• [ ] betterBonemeal (dispenser part)
• [ ] betterBonemeal (bonemeal part)
• [x] blazeMeal (dispenser part)
• [ ] blazeMeal (player part)
• [ ] chickenShearing (dispenser part)
• [ ] chickenShearing (player part)
• [x] clericsFarmWarts
• [ ] comparatorBetterItemFrames
• [ ] comparatorReadsClock
• [ ] dispenserPlacesBlocks
• [x] dispensersCarvePumpkins
• [ ] dispensersFeedAnimals
• [x] dispensersFillMinecarts
• [ ] dispensersMilkAnimals
• [x] dispensersPlaceBoatsOnIce
• [ ] dispensersPotPlants
• [x] dispensersStripBlocks
• [ ] dispensersStripBlocks (maybe the rest of coppers)
• [x] dispensersTillSoil
• [ ] dispensersToggleThings
• [x] dispensersUseCauldrons (fill/empty)
• [ ] dispensersUseCauldrons (powdered snow)
• [ ] dispensersUseCauldrons (washing)
• [ ] doubleRetraction
• [ ] emptyShulkerBoxStackAlways
• [ ] fallingBlockDispensers
• [ ] hopperMinecartItemTransfer
• [ ] maxSpongeRange
• [ ] maxSpongeSuck
• [ ] mobInFireConvertsSandToSoulsand
• [ ] pistonRedirectsRedstone
• [ ] reloadSuffocationFix
• [x] renewableEndstone
• [ ] renewableIce
• [x] renewableNetherrack
• [ ] renewableSand
• [ ] renewableWitherSkeletons
• [ ] repeaterPriorityFix
• [ ] scaffoldingDistance
• [ ] spiderJockeysDropGapples
• [ ] straySpawningInIgloos
• [ ] variableWoodDelays
• [ ] xpPerSculkCatalyst

Features definitely not suitable for gametest:

• accurateBlockPlacement
• blockStateSyncing
• commandPing
• dragonEggBedrockBreaking
• y0DragonEggBedrockBreaking
• enderPearlChunkLoading
• disablePlayerCollision
• flowerPotChunkLoading
• creeperSpawningInJungleTemples