Remove codegen and implement dbl_list as generic container

src/wapp.c

@@ -2,6 +2,7 @@
 #define WAPP_C
 
 #include "wapp.h"
+#include "containers/wapp_containers.c"
 #include "core/wapp_core.c"
 #include "prng/wapp_prng.c"
 #include "uuid/uuid.c"