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/michelf/php-markdown/test/resources/php-markdown-extra.mdtest/Footnotes.text

@@ -1,70 +0,0 @@
-This is the first paragraph.[^first]
-
-[^first]:  This is the first note.
-
-* List item one.[^second]
-* List item two.[^third]
-
-[^third]: This is the third note, defined out of order.
-[^second]: This is the second note.
-[^fourth]: This is the fourth note.
-
-# Header[^fourth]
-
-Some paragraph with a footnote[^1], and another[^2].
-
-[^1]: Content for fifth footnote.
-[^2]: Content for sixth footnote spaning on 
-    three lines, with some span-level markup like
-    _emphasis_, a [link][].
-
-[link]: http://michelf.ca/
-
-Another paragraph with a named footnote[^fn-name].
-
-[^fn-name]:
-    Footnote beginning on the line next to the marker.
-
-This paragraph should not have a footnote marker since 
-the footnote is undefined.[^3]
-
-This paragraph has a second footnote marker to footnote number one.[^1]
-
-This paragraph links to a footnote with plenty of 
-block-level content.[^block]
-
-[^block]:
-	Paragraph.
-	
-	*   List item
-	
-	> Blockquote
-	
-	    Code block
-
-This paragraph host the footnote reference within a 
-footnote test[^reference].
-
-[^reference]:
-	This footnote has a footnote of its own.[^nested]
-
-[^nested]:
-	This footnote should appear even though it is referenced
-	from another footnote. But [^reference] should be litteral
-	since the footnote with that name has already been used.
-
- - - -
-
-Testing unusual footnote name[^1$^!"'].
-
-[^1$^!"']: Haha!
-
- - - -
- 
-Footnotes mixed with images[^image-mixed]
-![1800 Travel][img6]
-![1830 Travel][img7]
-
-[img6]: images/MGR-1800-travel.jpeg "Travel Speeds in 1800"
-[^image-mixed]: Footnote Content
-[img7]: images/MGR-1830-travel.jpeg "Travel Speeds in 1830"