Support WP-CLI 2+

Merge pull request wp-cli#50 from wp-cli/db-credentials

Permit database credentials to be exported when finding installations

Merge pull request wp-cli#43 from grantpalin/install-installation

Replace "install" with "installation" where appropriate

Merge pull request wp-cli#41 from wp-cli/wp-path-field

Add `wp_path` as a reported field

Merge pull request wp-cli#36 from wp-cli/additional-ignored-paths

Use `--include_ignored_paths=<paths>` to include additional ignored paths

Merge pull request wp-cli#32 from wp-cli/ignore-app-dirs

Ignore a variety of additional generic app dirs

Merge pull request wp-cli#29 from wp-cli/log-search-completion

Log completion of the search process

Merge pull request wp-cli#27 from wp-cli/list-aliases

List aliases for found WP directories when they exist