feat: add validation to check for 'src-namespace-prefix' in plugin.yml

fix: improve antigen validation error message

feat: support virion 3.1

feat(plugin-dev): support multiple plugins in start.sh

fix: composer install should chdir

fix: display path when ParseError is encountered

• fixes #7
• fixes #9

use latest setup-php-action version

fix: handle ${} brace counting correctly

gitignore dist

fix: update x-virion field keys