rP4d4712b58d2a

Remove Chatlog entirely

Summary:
This commit removes ChatLog entirely. All of the application files are removed, and the migrations used are stubbed out. I stubbed the migrations as that allows for existing installs to make no changes, but new installs will not create the database.

Fixes T15126

Test Plan: Loaded up http://phorge.local/chatlog and confirmed the 404. Loaded up http://phorge.local/applications/view/PhabricatorChatLogApplication and confirmed the 404. Created a new database prefix and…