1.49

Removed non-portable function attributes. Implemented environment variable based customization. Updated the manual page. Removed use of system(). Implemented per-button windows for catching titlebar events and eliminating the need for manual button redrawing on exposure. Use more contrasting default colors. Added a stick button to make a window visible on all virtual desktops. Ported to OpenBSD and fixed NetBSD build. Implemented window kill--second click on the close button kills the client. Fixed Xephyr crash on window shade by implementing shading without unmapping the client window. Fixed maximization and fullscreen behavior conflicts by separating out raw max/min action functions from sanitized action functions. Set FRAME_EXTENTS accurate to presence of titlebar. Fixed mwm hints behavior--this fixes QT5 dialogs. Restricted certain actions when a window is fullscreen.