Program the bot to crawl, fix wood farming bugs

bot.py

@@ -142,9 +142,11 @@ def tick(global_state):
         g.y_v += g.y_a * utils.TICK
 
     block_below = g.chunks.get_block_at(floor(p.x), ceil(p.y-1), floor(p.z))
+    block_above = g.chunks.get_block_at(floor(p.x), ceil(p.y+1), floor(p.z))
     in_void = p.y < 0
     in_air = block_below in blocks.NON_SOLID_IDS or in_void
     in_water = block_below in blocks.WATER_IDS
+    g.crawling = block_above not in blocks.NON_SOLID_IDS
 
     if in_air:
         g.y_a = -36.0
@@ -204,6 +206,7 @@ def init(global_state):
     g.y_a = 0
     g.yaw = 360
     g.pitch = 0
+    g.crawling = False
 
     g.breaking = None
     g.break_time = 0