1.56

Added dynamic ewmh client list support. Handled GCC 7's new case fall-through warnings. Based unique client initialization on event serial. Added scheme-based atom mapping utility for ewmh atoms--ewmh.scm. Added scheme-based utility to map Xlib keys to jbwm functions--jbwm.scm. Replaced KeyMoveFlags structure with a simple bit masking. Resolved structure padding throughout. Preferred several recursive definitions.