lavfi: rename avfilter_all_* function names to avfilter_make_all_*

lavfi: rename avfilter_all_* function names to avfilter_make_all_*

A function name should tell what the function does rather than what
the function returns. This also avoids possible conflicts
(e.g. between a function and a public list of all supported formats),
and clarifies the code.

Breaks audio API/ABI, add a backward compatibility layer for video
API/ABI.