Use libdraw: add Xft and fallback-fonts support to graphics lib

- libdraw, util: add drw.{c,h}, util.{c,h} and update code.
- libdraw: fix drw_rect(): use w and h parameter.
- libdraw: print errstr if last character in string was ":" (sbase).
- libdraw: drw_clr_free() allow valid free(NULL).
- config.def.h: set default font to monospace.
- cleanup() on exit.
- LICENSE: update license string for dmenu -v to 2015.
- LICENSE: add myself to LICENSE

config.mk

@@ -13,8 +13,8 @@ XINERAMALIBS  = -lXinerama
 XINERAMAFLAGS = -DXINERAMA
 
 # includes and libs
-INCS = -I${X11INC}
-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS}
+INCS = -I${X11INC} -I/usr/include/freetype2
+LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} -lfontconfig -lXft
 
 # flags
 CPPFLAGS = -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}