Move all composer files inside the common directory

- 2022년 3월 개발팀 결정사항 적용
- 모듈 등 서드파티 자료 개발시 composer를 사용하면 상위 경로에 있는 코어의
  composer.json을 수정하고, 코어의 vendor 디렉토리를 건드리는 것이 기본값임
- 이를 방지하기 위해 코어의 composer.json과 vendor를 common 디렉토리 안으로
  이동하여, 모듈 경로에서 상위 폴더로 인식하지 않도록 함

vendor/leafo/lessphp/tests/README.md

@@ -1,24 +0,0 @@
-lessphp uses [PHPUnit](https://github.com/sebastianbergmann/phpunit/) for its tests
-
-* `InputTest.php` iterates through all the less files in `inputs/`, compiles
-  them, then compares the result with the respective file in `outputs/`.
-
-* `ApiTest.php` tests the behavior of lessphp's public API methods.
-
-* `ErrorHandlingTest.php` tests that lessphp throws appropriate errors when
-  given invalid LESS as input.
-
-From the root you can run `make` to run all the tests.
-
-## lessjs tests
-
-Tests found in `inputs_lessjs` are extracted directly from
-[less.js](https://github.com/less/less.js). The following license applies to
-those tests: https://github.com/less/less.js/blob/master/LICENSE
-
-## bootstrap.sh
-
-Clones twitter bootsrap, compiles it with lessc and lessphp, cleans up results
-with sort.php, and outputs diff. To run it, you need to have git and lessc
-installed.
-