Add more command-line options
Includes/requires !68 (merged).
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check-vulkan: Add basic command-line parsing with --help
This makes it reject unrecognised command-line options, but very little else so far.
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Add --version argument to most executables
This makes it easier to tell which version we are dealing with.
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check-vulkan: Optionally make the window visible
This is not used by the shared library, but can be useful for debugging.