Add "-h"/"--help" options to print a usage message and "-v"/"--version"
to print the current version.
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
Allow for specifying placeholders in shell scripts that are replaced
during build time. Predefine a "@PACKAGE_VERSION@" placeholder that is
replaced with the current version number. Also, rename all shell scripts
to ".sh.in".
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>