* Adding PATCHES keyword.
* Formatting fix.
* Move cpm_add_patches() outside if/else scopes.
* cmake-format: add PATCHES to CPMAddPackage.
* Integration tests for PATCHES command.
* Use get_filename_component() in place of cmake_path() for use with all cmake versions 3.14 and above.
* Added an example and improved comment for cpm_add_patches.
