patch: swallowHEADmaster

This patch adds "window swallowing" to dwm as known from Plan 9's
windowing system rio.

Clients marked with isterminal in config.h swallow a window opened by
any child process, e.g. running xclock in a terminal. Closing the xclock
window restores the terminal window in the current position.

This patch helps users spawning a lot of graphical programs from their
command line by avoiding cluttering the screen with many unusable
terminals. Being deep down in a directory hierarchy just does not make
the use of dmenu feasible.

Dependencies
        * libxcb
        * Xlib-libxcb
        * xcb-res

These dependencies are needed due to the use of the latest revision of
the X Resource Extension which is unsupported in vanilla Xlib.

Notes:

* The window swallowing functionality requires dwm to walk the process
  tree, which is an inherently OS-specific task. Only Linux and FreeBSD
  are supported at this time. Please contact one of the authors if you
  would like to help expand the list of supported operating systems.

* Only terminals created by local processes can swallow windows, and
  only windows created by local processes can be swallowed.

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