support git-url and zip-path in library installation

[ianfixes]

via arduino/arduino-cli#648

arduino-cli lib install <library name> now supports --git-url <url> and --zip-path <path>.

the config should be expanded to allow something like this:

compile:
  libraries:
    - someLibrary      # String value: let the Arduino library manager figure it out
    - localLibrary:    # Hash
      zip_path: ./wherever/it/is.zip
    - gitLibrary:      # Hash
        git_url: git@git.com:me/gitLibrary.git

Note the need to enable this feature in the first place arduino/arduino-cli#1075