fix: clap CLI definitions and manpage generation

- add #[group(skip)] to all Parser-derived structs
- fix conflicts_with and arg definitions for correct CLI behavior
- refactor bin entry points to support manpage generation

core/man/start-cli/start-cli-s9pk-convert.1

@@ -0,0 +1,16 @@
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.TH start-cli-s9pk-convert 1  "convert " 
+.SH NAME
+start\-cli\-s9pk\-convert \- Convert an s9pk from v1 to v2
+.SH SYNOPSIS
+\fBstart\-cli s9pk convert\fR [\fB\-h\fR|\fB\-\-help\fR] <\fIS9PK\fR> 
+.SH DESCRIPTION
+Convert an s9pk from v1 to v2
+.SH OPTIONS
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Print help
+.TP
+<\fIS9PK\fR>
+Path to s9pk package file