Cleaning and better UX in general

Cargo.lock

devenv.nix

spp-lib/src/core/designer/core.rs

spp-lib/src/core/designer/factory_io_builder.rs

spp-lib/src/core/designer/mod.rs

spp-lib/src/core/designer/recipes_category_builder.rs

spp-lib/src/core/errors.rs

spp-lib/src/core/mod.rs

spp-lib/src/exporter/core.rs

spp-lib/src/exporter/errors.rs

spp-lib/src/exporter/svg.rs

spp-lib/src/satisfactory/rates/core.rs

spp-lib/src/satisfactory/rates/mutable_rate.rs

spp-lib/src/satisfactory/recipes/alt_recipes.rs

spp-lib/src/satisfactory/recipes/alt_recipes.rs.mustache

spp-lib/src/satisfactory/recipes/core.rs

spp-lib/src/satisfactory/recipes/ext_recipes.rs

spp-lib/src/satisfactory/recipes/pow_recipes.rs

spp-lib/src/satisfactory/recipes/std_recipes.rs

spp-lib/src/satisfactory/recipes/std_recipes.rs.mustache