Add dummy targets as dependencies when tools are unavailable #16
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When external tool dependencies are not installed, the dummy targets are not appended to their respective target list. Consequently, the CMake generate step fails when adding dependencies with empty/uninitialized variables.
Also modified the print messages slightly to be more consistent with CPM's printouts.
Tested by setting the tool conditional checks to 'false' manually and also by using a Windows GitHub Action in the "ModernCppStarter" repository without deliberately installing Clang or
cmake-format
.