Wild Update: Improvements to Taigas

The Taiga biome can be pretty bland, and drags on for large distances. The problem is a lack of variation in both the ground and the trees; there should be rare oak trees among the endless pines and some moss/stone/granite patches instead of only grass and dirt. This could also be a parity fix; bring Bedrock's Taiga tree vines to Java. These are all small changes, but together would really improve immersion.