rename the "cache" folder to "renderCache"

Just to make the folder's purpose a bit more obvious

core/src/main/java/com/seibel/lod/core/file/structure/AbstractSaveStructure.java

@@ -13,7 +13,7 @@ import java.io.File;
  */
 public abstract class AbstractSaveStructure implements AutoCloseable
 {
-    public static final String RENDER_CACHE_FOLDER = "cache";
+    public static final String RENDER_CACHE_FOLDER = "renderCache";
     public static final String DATA_FOLDER = "data";
 	
     protected static final Logger LOGGER = DhLoggerBuilder.getLogger();