Refactor: Cleanup and expand client code to support <version|q|reload|debug>

Further refactoring of the client code.  Supported commands:

- debug:   Toggle PID 1 debug flag
- version: Show Finit version or custom header string
- reload:  Reload config files in /etc/finit.d/, same as SIGHUP

Also supported is the legacy 'init q' command, to reload config.

The 'status' command now supports an optiona '-v', either as an
argument to init itself, or as argument to the command.  When it
is given 'status' lists verbose information about all services.
Currently only the service arguments are listed.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

TODO.md

@@ -28,14 +28,9 @@ General
   service it monitors + `.sh`.
 * Add support for `/etc/sysctl.d`
 * Add compile-time supoprt for running `/bin/sh` instead of `getty`
-* Add support for `init <q | reload-configuration>` and `SIGHUP` to
-  have finit reload its `finit.conf`, but also
-* Add support for inotify to automatically reload `finit.conf`
 * Implement `initctl stop|start|restart|reload|status <SVC>` and
   `service <SVC> stop|start|restart|reload|status` on top
 * Add PRE and POST hooks for when switching between runlevels
-* Add support for `init -v,--version | version`
-* Cleanup move sources from top-level directory to `src/` and `include/`
 * Make sure to install `queue.h` to `$(PREFIX)/include/finit/queue.h`
 * Move `finit.conf` "check" command to plugin which checks `/etc/fstab`
   instead.  This is the de-facto practice.  But keep the check command