tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues fou

tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues found along the way.

Cherry-picked from #13489
Closes #13600

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misc: fix spelling

Closes #10437

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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tests: add 3 new HTTP/2 test cases, plus https: support for nghttpx

- a simple https get
- a simple https post
- a multi get of 4 requests and check that same connection was used

tests: add 3 new HTTP/2 test cases, plus https: support for nghttpx

- a simple https get
- a simple https post
- a multi get of 4 requests and check that same connection was used

Closes #10114

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