First idea implementation

bukkit-helper-117/src/main/java/org/dynmap/bukkit/helper/v117/BukkitVersionHelperSpigot117.java

@@ -58,11 +58,19 @@ import java.util.Map;
 /**
  * Helper for isolation of bukkit version specific issues
  */
-public class BukkitVersionHelperSpigot117 extends BukkitVersionHelper {    
-    public BukkitVersionHelperSpigot117() {
+public class BukkitVersionHelperSpigot117 extends BukkitVersionHelper {
+	  private final boolean unsafeAsync;
+
+	  public BukkitVersionHelperSpigot117() {
+		this.unsafeAsync = true;
     }
-    
-    /**
+
+	  @Override
+	  public boolean isUnsafeAsync() {
+		return unsafeAsync;
+	}
+
+	  /**
      * Get block short name list
      */
     @Override