Fix fast schematic reader/writer

- Have both sponge and fast r/w available but default to "fast"
 - Correctly "offset" entities in the schematic, and add a legacy mode for loading old FAWE schematics with entities required.
 - Lazily reading means it's read in order of appearance in the inputstream so we need to read schematic version first (skip past everything) and then reset the stream. Fixes #740
 - Add an FAWEVersion to the metadata
 - Correctly actually return a BlockArrayClipboard when required. Fixes #454

worldedit-core/src/main/java/com/boydti/fawe/jnbt/streamer/StreamDelegate.java

@@ -200,7 +200,7 @@ public class StreamDelegate {
             Object raw = is.readTagPayloadRaw(type, depth);
             valueReader.apply(0, raw);
         } else {
-            is.readTagPaylodLazy(type, depth + 1, this);
+            is.readTagPayloadLazy(type, depth + 1, this);
         }
     }