Added blockplacemods module

Adds a few nifty features with per player customization:
- Placing a slab automatically turns it upside-down
- Placing a cauldron automatically fills it
- Right clicking a cauldron with empty hand or redstone dust lowers
water level

main.py

@@ -38,6 +38,8 @@ shared["load_modules"] = [
     "adminchat",
     # Adds /badge, allows to give players achievements
     "badges",
+   	# Adds a few block placement corrections/mods
+   	"blockplacemods",
     # Adds /calc, toggles automatic solving of Math expressions in chat
     "calc",
     # Plugin to locate laggy chunks. /lc <n> lists chunks with more than n entities