Simplicity - simple world generation

fixed an error with groves that caused a crash

deleted some laggy features

tweaked mangroves leaves to not generate too far from the trunk causing them to decay and cause lag

added small and tall trees to taigas, also added more ferns and tall grass

added tall grass to old growth taigas

some tweaks to the new cherry biome

added "ice trees" to ice spikes

cactus finally work as intended (now they generate 3/4 blocks tall)

added large ferns to dark forest

savanna have a little less trees, not big of a difference they just don't generate every single chunk

tweaked creature spawning in all biomes

creepers and skeletons now have a minumin to spawn 1 per group and maximum 4 per group (vanilla is minimum 4 maximum 4)