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Fix #639: restapi: Handle CORS preflight requests (OPTIONS)

This adds support for handling preflight requests in the REST API
and fixes currently mostly broken CORS.

Before we just let the user add custom response headers to the
configuration "headers" key but this is not the best way because
CORs headers and requests need special handling and doing it wrong
has security implications.

Therefore, I have added specific CORS-related configuration options
which control CORS behavour. We are forced to change the "headers"
defaults and will notify the users about this in the changelog.

License: MIT
Signed-off-by: Hector Sanjuan <code@hector.link>

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