Misc fixes.

Closes a few old youtrack issues which I don't remember because I had
like 30 tabs open, and a few other issues which I found while testing
some of those.

worldedit-core/src/main/java/com/sk89q/worldedit/function/GroundFunction.java

@@ -85,9 +85,9 @@ public class GroundFunction implements LayerFunction {
         if (depth == 0) {
             if (function.apply(position)) {
                 affected++;
+                return true;
             }
         }
-
         return false;
     }