add small matrix/vector library working with simdwrappers + small additions to zipping

1. matrix library with compiletime loop unrolling that works well with simdwrapper.
   most of the credit goes to @ahennequ @graven and Florian Lemaitre.
   We may need to enable a higher inline limit to take full advantage of the inlining that unwind can yield.
2. small additions to simdwrappers (+= -= ...)
3. made zips work with boost::combine and structured bindings for zips
4. until now, proxies could just have the name "proxy", now its an argument to the macro

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• c8d9e36e - post increment correction

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mentioned in merge request Phys!633 (merged)

mentioned in merge request Rec!1728 (merged)

a unit test which does some trivial algebra would be nice... (and in order to make the test more reproducible / easier verifiable, it could be restricted to use integral types only ;-)

assigned to @mstahl

@nnolte please consider adding doxygen documentation to the new methods. Small examples of how you use the code in the docstrings would be really cool. And/or in case you follow @graven suggestions of adding tests, consider adding a pedagogical flavor to it :)

I'm assigning it back to you now to answer to the threads. Please assign it back to me when it's ready for testing

assigned to @nnolte and unassigned @mstahl

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• dc99ff4f - applied some comments
• 778e1430 - add test for matvec

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• efa4e4f0 - formatting

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resolved all threads

assigned to @mstahl and unassigned @nnolte

• [2020-01-13 12:41] Validation started with lhcb-master-mr#342
• [2020-01-14 13:55] Validation started with lhcb-master-mr#349
• [2020-01-15 12:53] Validation started with lhcb-master-mr#357
• [2020-01-16 09:27] Validation started with lhcb-master-mr#360
• [2020-01-17 13:42] Validation started with lhcb-master-mr#366
• [2020-01-19 00:10] Validation started with lhcb-gaudi-head#2507
• [2020-01-20 00:05] Validation started with lhcb-gaudi-head#2508

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• ff6f87ae - fill with double to avoid pointer/float ambiguity

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• 2d4f6074 - mah

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• e5a20119 - operator+= for sse types

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• 3208dead - add size to sse

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