As a side effect this allows us also to handle errors more gracefully
and to reduce memory load by outputting decoded frames immediately.
Also the code was changed a bit to reduce the number of redundant mutex
lock/unlocks.
cargo-c will produce a pkg-config file making it easier to statically
link plugins.
Also add 'static' features for plugins depending on < 1.14 as this is the
minimal required version to use static linking because of ABI changes in
core.
There is no way to dynamically ask Cargo to build static or dynamic lib
so we have to build both and pick the one we care when doing the meson
processing.
Fix#88