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Replace clap with pico_args

Open David Karrick requested to merge Rustywolf/pkgar:pico into master

This pull request replace the clap command line argument parser with pico_args.

This has the following benefits:

  • Reduces binary size by 332 KiB (when compiled with RUSTFLAGS='-C codegen-units=1 -C panic=abort -C link-args=-s' cargo build --release)
  • Reduced time to compile by 3 seconds

The UI is mostly the same. The help information is more colorful now. Pico_args parses arguements linearly so error messages will display the first argument not found (whereas clap would tell you all of them).

Edited by David Karrick