Porting the CRAB engine to SCUMMVM.

The SCUMMVM project with its hundreds of engines can run a huge library of games. It welcomes the addition of new engines to further increase the number of games it supports. This project aims to integrate the CRAB engine in SCUMMVM. The CRAB engine was developed by Pyrodactyl Games and was used in several of the games which the studio released. Most notably, this engine was used in the game called Unrest, a story-driven adventure RPG set in ancient India that adapts to death, failure, and the choices the player makes.