Updating dependencies to be able to compile again, plus various cleanups

[arduano]

I came here after noticing that I can't build dvm on NixOS due to openssl issues. Turns out dvm depended on an old version of openssl via the dependency tree, meaning it can't compile on any rolling release distros anymore (including Arch, I tried).

I started with the openssl issue, and while upgrading all packages, I ended up having to fix many errors surrounding the CLI handling code (due to upgraded packages), so I cleaned everything up.

• Updated all packages, removed anything deprecated.
• Because of the above, dvm can now build on Arch and Nix again, as dvm depended on a deprecated verision of openssl through reqwest.
• Removed all aliases. They weren't documented anyway, and many were conflicting, e.g. r for remove and run.
• Removed duplicate command building code. The codebase had a derive-based and a builder-based command system, with the builder-based one being used purely for completions.
• Removed the list of constant strings. Many of them were replaced with env!() invocations, e.g. env!("CARGO_PKG_VERSION"), the rest I copied into their respective use sites.
• Renamed the show subcommand to list, as that's more commonly used in other CLI tools.
• Added a LICENSE file to reflect the license field in the Cargo.toml file.

I didn't bump the version number.

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As a side note, I wouldn't mind taking over the maintenance of this project, as I regularly use it. My plan was to PR it into the Nix packages registry, but due to the openssl issue, I couldn't do that.

[diced]

I kinda just forgot about this, everything looks good to me! Also doesn't the license need to be changed, I think I will just add a gpl-3 license later

[arduano]

I've updated the license in the PR, is that ok? or should I revert that

[diced]

Yeah looks good, I'm gonna give it a build on my end and test it out, and merge once its all done. I'll also update the arch packages along with it :)

[diced]

AUR packages were updated like 2 hours ago, forgot to say