Move offset, size and stride to separate chunk structure that we
can keep in shared memory.
Add shared metadata type to hold the memory block holding the
metadata.
spa_serialize -> pinos_serialize
Improve PinosPort, move links to the object and make it part of
PinosNode
Work on improving signals to react to changes in the graph
Error when a client-node becomes unlinked, like when removing a camera.
Move the proxy plugin to the client-node
Move serialization code to pinos because its specific to pinos
Move some functions to the .h files
Make the mapper dynamic
