Add scanning functionality

[tuxinal]

same as #170 but squashed to avoid the mess

[tippfehlr]

What does this do? Scan a folder for importing existing mods into ferium?

[LunarN0v4]

it's a bit weird since it doesn't seem to build properly

[tippfehlr]

it's a bit weird since it doesn't seem to build properly

I can confirm that this isn’t building:

error[E0432]: unresolved imports `libium::config::structs::ModPlatform`, `libium::scan`
  --> src/subcommands/scan.rs:9:43
   |
9  |     config::structs::{Mod, ModIdentifier, ModPlatform, Profile},
   |                                           ^^^^^^^^^^^ no `ModPlatform` in `config::structs`
10 |     scan,
   |     ^^^^ no `scan` in the root
   |
   = help: consider importing this module instead:
           crate::subcommands::scan

error[E0433]: failed to resolve: could not find `ModPlatform` in `structs`
   --> src/main.rs:357:71
    |
357 |                 preferred_platform.unwrap_or(libium::config::structs::ModPlatform::Modrinth),
    |                                                                       ^^^^^^^^^^^ could not find `ModPlatform` in `structs`

error[E0412]: cannot find type `ModPlatform` in module `libium::config::structs`
  --> src/cli.rs:90:61
   |
90 |         preferred_platform: Option<libium::config::structs::ModPlatform>
   |                                                             ^^^^^^^^^^^ not found in `libium::config::structs`

error[E0412]: cannot find type `ModPlatform` in module `libium::config::structs`
  --> src/subcommands/scan.rs:18:50
   |
18 |     preferred_platform: libium::config::structs::ModPlatform,
   |                                                  ^^^^^^^^^^^ not found in `libium::config::structs`

error[E0609]: no field `project_id` on type `&_`
  --> src/subcommands/scan.rs:51:69
   |
51 |                         ModIdentifier::ModrinthProject(modrinth_mod.project_id.clone())
   |                                                                     ^^^^^^^^^^

error[E0609]: no field `mod_id` on type `&_`
  --> src/subcommands/scan.rs:54:73
   |
54 |                         ModIdentifier::CurseForgeProject(curseforge_mod.mod_id)
   |                                                                         ^^^^^^

Some errors have detailed explanations: E0412, E0432, E0433, E0609.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `ferium` due to 6 previous errors

[tuxinal]

you have to change the libium dependency in Cargo.toml to the squash branch of my fork for it to build

What does this do? Scan a folder for importing existing mods into ferium?

Yes exactly that see #57