Remove a bunch of Post Format template functions.

* get_post_format_meta()
* add_chat_detection_format()
* get_content_chat()
* get_the_post_format_chat()
* the_post_format_chat()
* get_content_quote()
* get_the_post_format_quote()
* the_post_format_quote()
* get_the_post_format_url()
* the_post_format_url()
* get_the_remaining_content()
* the_remaining_content()

see #24452

git-svn-id: https://core.svn.wordpress.org/trunk@24399 1a063a9b-81f0-0310-95a4-ce76da25c4cd