Allow building metal without documentation, examples and tests #134
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Users including metal in their projects using CMake's ExternalProject_Add,
FetchContent or a git submodule with
add_subdirectory
might not want tobuild the docs, examples or tests. In fact, they might not even have the
dependencies (doxygen for docs, boost for examples), which causes CMake to
print a warning even though it doesn't cause build failures.
For such users metal now provides options METAL_BUILD_DOC,
METAL_BUILD_TESTS and METAL_BUILD_EXAMPLES that are ON by default, but
can be turned off by consumers.