wrappers for err, errx, warn and warnx respectively when running in foreground
and call syslog functions when running in daemon mode.
Also add and use an extra log_info function for other types of information.
described by a structure with pointers to functions.
- Clearly separate the "selection" mode (which provides copy and paste support
in console) from wsmoused's main program.
- Added the "modes" property to the configuration file and the "-m" command
line option to specify which modes should be activated. (this is mostly
useless for now, as only the "selection" mode exists; a new mode will
be added soon, hopefully).
- While here, several style fixes according to share/misc/style.
