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Use DBR_VFIELD #3

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Use DBR_VFIELD #3

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mdavidsaver
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Make use of new features of epics-base/epics-base#71 and mdavidsaver/epics-base#1 . Adds new record types svectorinRecord and pvstructinRecord as examples of the DBR_VFIELD interface. Also changes QSRV to understand these new vfield types.

svectorinRecord is similar to aaiRecord while also allowing a driver to move array data in/out by reference using a shared_vector<const void> as .VAL. This comes with a restriction that the PVA ScalarType not change, which is enforced by record support.

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