Add PhutilInvalidStateException class

Summary: There's a bunch of Call %s before calling %s! exceptions that can be simplified with a custom script.

Test Plan: Wrote unit tests.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12803