common: Consolidate Assuan server argument handling.
* common/Makefile.am (common_sources): Add new files. * common/server-help.c: New file. * common/server-help.h: Likewise. * agent/command.c: Drop argument handling primitives in favor of using the consolidated ones. * dirmngr/server.c: Likewise. * g10/server.c: Likewise. * g13/server.c: Likewise. * scd/command.c: Likewise. * sm/server.c: Likewise.
- Signed-off-by: Justus Winter <justus@g10code.com>