Improve footprint by allowing element selection during static link stage -> gst-plugins-ugly

This MR intends to alleviate gstreamer-full library containing only a set of elements from a plugins. During the link stage of gstreamer-full, the dead code path will be removed and the final binary size will be smaller.

It mainly allows to register element individually instead of registering the whole plugin.

Edited by Stéphane Cerveau

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