test: define default clang args for testing #256
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For starters, define the language stardard to use. Use c17 and c++17, fairly arbitrarily. Tests can override this. We can remove the std option from template.yaml.
This is a bit more convoluted than should be necessary, for a few reasons:
Extension tests use the directive options from directive string. For that, the defaults should be specified in conf.py, but hawkmoth_clang is not domain specific, and can't be used. See [1]. We need to insert the defaults in directive options.
We want to preserve the original directive options, and present those in examples documentation. However, in all testing, we need to amend the defaults.
Note that the parser selects the -x language option based on domain and filename suffix.
[1] #255