fixed superpickaxe for gravel & lightstone, preprocessors faster than postprocessors, added methods so same-type changes are visble client-side, fixed fixliquid & setblocks block count

src/main/java/com/sk89q/worldedit/data/ForwardSeekableInputStream.java

@@ -34,7 +34,7 @@ public class ForwardSeekableInputStream extends InputStream {
     @Override
     public int read() throws IOException {
         int ret = parent.read();
-        position++;
+        ++position;
         return ret;
     }