Billy O'Neal 309f6fc9bc
[vcpkg] Delete unused --purge-tombstones and introduce BufferedPrint class (#12049)
* Introduce buffered_print class to manage buffered write patterns like in the ci command.

* Remove --purge-tombstones option.

* Law of demeter.

* Make buffered_print imobile.

* buffered_print => BufferedPrint

* Fix merge conflict.
2020-06-26 12:16:17 -07:00
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