Modernize cmake project files

Fix install target

Update cmake-format config file

Format all cmake files.

Update CPM.cmake version.

Use FILE_SET HEADER to verify and install the header files.

Prevent build problems caused by CPM_USE_LOCAL_PACKAGES

Prevent problems with doctest if local found

.github/workflows/install.yml

@@ -29,6 +29,7 @@ jobs:
       - name: build and install library
         run: |
           cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Release
+          cmake --build build --target all_verify_interface_header_sets
           sudo cmake --build build --target install
           rm -rf build