Engines have test and no leak of memory

All test works and i add -fsanitize=address in the makefile engine in test mode to ensure we do a good usage of memory in the engine. For the mmoment all my test exit without any loose of memory and I add some free in engine especially in verify_exit functions because we call them in all level with big structure.

Engine seems good, I will work on some levels create for testing advanced engine in order to test them in real condition.