[1.13.v7] Changed the code so that instead of guessing the tree's log structure based on its type, the tree gets "scanned" so that all nearby logs (within 1 block) are located and destroyed.

Main changes:

• no more floating logs, and thus no more floating leaves
• acacia trees are now supported
• ONLY logs and saplings drop upon "felling" a tree, nothing else
  
• the simpler code may reduce lag that might've existed prior

Since metadata isn't stored on server restarts i was forced to determine if a log is part of a tree based on how many leaves it has. So extremely small trees, while being rare, probably won't fell at all. Also, only logs and 1 or 2 saplings drop upon felling. Vines will not drop anymore, and anything else in the vicinity will not drop except items like cocoa beans (because they're connected to the tree). Bedrock, stone, dirt, etc. will no longer break at all. If you want to farm vines or grass, you'll need to farm them with shears.