add wavefront loader

start adding various scenes to test gpu rigid body pipeline
reserve more memory for shapes (concave triangle mesh can be huge) in GLInstancingRenderer
fix a few crashes when 0 objects

demo/ObjLoader/list.h

@@ -0,0 +1,29 @@
+#ifndef __LIST_H
+#define __LIST_H
+
+typedef struct
+{
+	int item_count;
+	int current_max_size;
+	char growable;
+
+	void **items;
+	char **names;	
+} list;
+
+void list_make(list *listo, int size, char growable);
+int list_add_item(list *listo, void *item, char *name);
+char* list_print_items(list *listo);
+void* list_get_name(list *listo, char *name);
+void* list_get_index(list *listo, int indx);
+void* list_get_item(list *listo, void *item_to_find);
+int list_find(list *listo, char *name_to_find);
+void list_delete_index(list *listo, int indx);
+void list_delete_name(list *listo, char *name);
+void list_delete_item(list *listo, void *item);
+void list_delete_all(list *listo);
+void list_print_list(list *listo);
+void list_free(list *listo);
+
+void test_list();
+#endif