cmake: only add ui tools and their dependencies in toplevel build #137
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When adding gr-digitizers to a build using add_subdirectory or fetch_content, the targets for the ui tools and dependencies can clash. This commit removes them from the build if this project is not the top-level cmake project.
Also default disables gr-digitizer tests in that case by default.
Longer term we should improve the cmake in all projects to allow overriding dependencies and correctly use cmake namespaces for the targets...