Implemented BloodAltar modification with redstone lamp below altar (#1635)

* Implemented BloodAltar modification with redstone lamp below altar

- strong and weak Redstone signal of power 15 (similar to BlockLever)
- activates when crafting finishes and a BlockRedstoneLight is directly below the altar
- deactivates when the next crafting cycle is about to begin

Use case:

- Redstone-controlled automatic ejection of crafted goods

* Removed Docs

* Meta to use 0 for off, 1 for on

* Syntactic sugar & storing value

src/main/resources/assets/bloodmagic/blockstates/altar.json

@@ -8,6 +8,14 @@
   },
   "variants": {
         "normal": [{
+        }
+        ],
+    "powered=true": [
+      {
+      }
+    ],
+    "powered=false": [
+      {
 
         }]
     }