CSP3 parsing keeps the first directive of each name in a policy and ignores
later repeats; Chrome reports "Ignoring duplicate Content-Security-Policy
directive". parseCsp flattened every policy's directives into one stream, so
a header such as `script-src 'self'; script-src 'unsafe-inline'` reported the
ignored `'unsafe-inline'` directive as declared and counted nonces and hashes
from it. Track directive names per policy so only the effective directive is
retained, while the same name in separate comma-separated or repeated-field
policies is still listed once per policy.
Dragolone
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