Add optional output directory argument to generators #8
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I have discussed this change in #5.
Utilities which create files determine their location by either having the user explicitly specify the filenames (using command-line arguments for example) or by at least specifying the output directory to which the files should be saved.
Current test generators always put hardcoded filenames into the current working directory. This is inflexible. This behavior is understandable, because test programs shouldn't be held to the same standard as user-facing CLI utilities, however, this issue happens to negatively affect Meson integration.
This isn't a bug fix, the old behavior is fully functional.
I have done extensive testing of this system on Windows. I can confirm that localisation of error messages and filesystem paths containing unicode characters work as expected.
I have also verified that this change fixes the issues I've had with Meson integration (briefly touched upon at #5).