feat: initial CLI structure

- init: create plugin boilerplate
- install: install from local path with deps
- list: show installed plugins
- validate: check manyplug.json syntax

node_modules/jsonfile/utils.js

@@ -0,0 +1,14 @@
+function stringify (obj, { EOL = '\n', finalEOL = true, replacer = null, spaces } = {}) {
+  const EOF = finalEOL ? EOL : ''
+  const str = JSON.stringify(obj, replacer, spaces)
+
+  return str.replace(/\n/g, EOL) + EOF
+}
+
+function stripBom (content) {
+  // we do this because JSON.parse would convert it to a utf8 string if encoding wasn't specified
+  if (Buffer.isBuffer(content)) content = content.toString('utf8')
+  return content.replace(/^\uFEFF/, '')
+}
+
+module.exports = { stringify, stripBom }