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Overlay/Blend surface generator API

U. Artie Eoff requested to merge ullysses.a.eoff/gstreamer-vaapi:blend-surface-generator into master

This new API allows the user (vppoverlay) to call a single method (process) which handles the [display] lock/unlock logic internally for them.

This API supersedes the risky begin, render, end API. It eliminates the need for the user to call a lock method (process_begin) before processing the input buffers (process_render) and calling an unlock method (process_end) afterwards.

Resolves #219 (closed)

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