mob spawning now according Minecraft sources

definitions/readme.txt

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+To allow testing for mob spawn conditions some flags have to be set according
+to the Minecraft source code. The Minecraft Wiki is not correct in all cases.
+
+In the Minecraft source code some major flags are defined for all blocks:
+ isOpaque renderAsNormalBlock isLiquid and canProvidePower
+
+isLiquid:
+ is obvious and true for still and flowing water and lava
+
+canProvidePower:
+ is obvious all blocks that could create a redstone signal:
+  PressurePlate(s), Button(s), TrappedChest, DaylightDetector, DetectorRail,
+  Lever, PoweredOre = Redstone Block, RedstoneLogic = Repeater and Comperator,
+  RedstoneTorch, RestoneWire, TripWireSource = Tripwire Hook
+
+isOpaque and renderAsNormalBlock
+ both are more or less the same except some rare special cases:
+  opaque blocks are always rendered as normal blocks
+  in case they are not opaque (= transparent) they are mostely
+  rendered NOT as normal block except:
+   Ice, EndPortalFrame, Leaves (all kind), MobSpawner,
+   (also: Redstone Wire in case not powered)
+
+  to detect that special case, this tag has to be placed
+      "transparent": true,
+      "rendercube": true
+
+  all other transparent blocks have to be flagged only with
+      "transparent": true
+
+List of tranparent blocks:
+ Anvil, PressurePlate(s), Beacon, Bed, Ice, BrewingStand, Button(s), Cactus,
+ Cake, Carpet(s), Cauldron, Chest(s), Cocoa, DaylightDetector, Door(s), DragonEgg,
+ EnchantmentTable, EnderChest, EndPortal, EndPortalFrame, Farmland, Fence,
+ FenceGate, Fire, Flower(s), FlowerPot, Fluid = Water/Lava, Glass, HalfSlab(s),
+ Hopper, Ladder, Leave(s), Lever, MobSpawner, Pane(s), PistonBase, PistonExtension,
+ PistonMoving, Portal, Rail(s), Repeater, Comperator, RedstoneWire, Reed, Sign,
+ Skull, Snow, Stair(s), Torch, TrapDoor, TripWire, TripWireSource, Vine, Wall, Web
+
+All this information is gathered from the 1.6.4 source code.
+As at the moment no deobfuscated 1.7.x code is available.
+
+[EtlamGit]