Rename getFiles method on content catalog to getAll
The name of the getFiles method is not consistent with the other file-oriented methods on the content catalog. The related method names (getById, findBy, getByPath) treat "file" as implicit. Therefore, the parallel method name would be getAll instead of getFiles.
Using the term "file" is also inconsistent with resourceResource and resourceId. So it's best just to keep the term implicit.