* Add support for DocC
DocC "files" are actually folders `.docc` appended to the name, but Xcode 13 treats them differently. Therefore, we need to exclude them from the normal BuildPhase.
Resolves#1089
* Add tests for DocC
Expanded an existing test to include .docc support.
Also added a .docc catalog to the Test Project.
* Update changelog.md
* Update changelog.md to get the correct PR Link