Add an option to skip dependency installation for CMake #71
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Currently
CMakeLists.txtis configured in a way that the build dependencies are downloaded (such asabseil-cppandgoogletest) automatically during the build process. This can make it difficult to includerobotstxtinto other C++ projects as a submodule which is a common practice in C++ ecosystem. If a project is already usinggoogletestorabseil-cpp, then it's possible to get 2 different versions of the same library in the same project which is not ideal and might cause linker issues.This PR introduces
ROBOTS_SKIP_DEPSwhich allows to skip dependency installation and access the dependencies by other means (i.e.find_package).