Refactor command-line options to provide some level of compatibility with symchk

[DrChat]

This will make it easier to use this tool as a drop-in replacement for symchk down the line.

Input options:

• /if <Filename>
• /im <Manifest>

PDB options:

• /pa Public and private symbols
• /pf Verify that PDBs contain full source information
• /ps Verify that PDBs are stripped
• /pt Verify that PDBs are stripped but contain type information

Output options:

• /om <Manifest>

[DrChat]

Last I checked, clap does not support / commands.... This is probably never going to get done.
clap-rs/clap#2468