Document Vanilla Registries (#300)

* document forge registry wrapper

* ensure gamerules only happens on overworld

* add vanilla alias

* furnace builder uses parent fields

* adjust the text of the replace for crafting recipes

* use methods instead of field access

* document vanilla minecraft

* remove custom vanilla with new minecraft

* include method override info for vanilla

Author: WaitingIdly

examples/postInit/custom/events.groovy

@@ -0,0 +1,16 @@
+
+import net.minecraftforge.event.entity.living.EnderTeleportEvent
+import net.minecraftforge.event.world.BlockEvent
+import net.minecraft.util.text.TextComponentString
+
+
+// Use eventManager.listen and listen to the desired event.
+/*eventManager.listen(BlockEvent.BreakEvent) {
+    it.setCanceled(true) // Many events can be canceled.
+    it.player.sendMessage(new TextComponentString("${it.getState().getBlock().getLocalizedName()} Block was prevent from being broken"))
+}*/
+
+// The outer parentheses and inner curly braces are optional.
+eventManager.listen(EnderTeleportEvent) { event ->
+    event.setAttackDamage 19.5f
+}