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Use DeviceBuffer in GPU update and NBNXM code

Andrey Alekseenko requested to merge use-devicebuffer-instead-of-raw-pointers-in-gpu-update into master

... instead of raw device pointers and DeviceBuffer<float3>.

We try to use DeviceBuffer<Float3>, but in some places we have to use DeviceVector<gmx::RVec>, until we can define FloatN types without including any backend-specific headers. Currently, Float3 is defined as gmx::RVec, so this should not cause any issues.

Also added some helper functions to convert RVec ̌<-> Float3 <-> float3.

Preparation for #3932 (closed) and #3941 (closed).

Edited by Andrey Alekseenko

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