adapted Makefile for C++
started reimplementing slock in C++

-implemented argparser
-implemented simple logger
refactored streq to util.h
added logger support for integral types, added passwd check for UID
added Logger level DEBUG
improved makefile to handle three colors
adapted argparser to produce a loglevel; added debug flag
replaced slock.c by slock.cc
logger now echoes to stdout if verbose or debug
started implementing locking/unlocking
removed HAVE_BSD_AUTH from DEFS
added a bell fralg to the argparser; fixed reading XEvents; locking/unlocking
now works; double free error remaining
removed useless XBell calls
closed memory leak: logger now gets freed on exit
removed -d and -l flag, one has to use the long variant
added install target; set version to 1.0
added --version flag to argparser
changed logger timestamp format to YYYY-MM-DD HH:MM:SS
removed potentially dangerous debug loggings; changed some errx to error logging