* refactor(migrator): rename `installed` to `baseVersion`
* feat: `vue upgrade --from` option and a new `vue migrate` command
* fix: fix support for `vuePlugins.resolveFrom` option
* chore: add a fixme comment
* fix: use loadModule instead of manually calculating the package.json path
This also fixes support for monorepo.
(TODO: tests)
* fix: treat `resolveFrom` as `context`, fixing edge cases
* fix: use read-pkg instead of loadModule, avoid messing up require cache
* fix: getInstalledVersion still requires `loadModule` to support monorepo
