Summary:
An attempt to resolve T9600.
- `PhabricatorPasteQuery` builds truncated snippet when requested using `needSnippet()`.
- `PhabricatorPasteSearchEngine` uses Paste snippet istead of content.
- `PhabricatorSourceCodeView` accepts truncated source and type instead of line limit.
Test Plan: Generated some content for Paste application and also added huge JSON oneliner. Checked Paste application pages in browser.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Maniphest Tasks: T9600
Differential Revision: https://secure.phabricator.com/D14313
