Rework command line interface

[cgzones]

Use subcommand instead of option arguments. This has the benefit of supporting shell wildcards.

Old usage:

checksec -f /bin/true --no-color
checksec -d /bin --json --pretty
checksec -p bash --maps
checksec --pid 1,42
checksec -P

New usage:

checksec --no-color exe /bin/true
checksec --format json-pretty exe /bin
checksec proc-name --maps bash
checksec proc-id 1 42
checksec proc-all

checksec proc-id $(pidof firefox)
checksec exe /bin/system*
dpkg -L apt | checksec

Alternative to #25

[etke]

Thanks for all the PRs! I appreciate your contributions to the project.

I was planning on migrating to clap derive CLI, just haven't had time to work much on checksec.rs for the past while.

Plan is to separate things like proc-id proc-name, proc-all into their own subcommands of the proc subcommand, I'll do this work and reference your PR for the next version bump.