Kil the old input/output code from the headers.
Made LavInputDescriptor
Make graphs record the block size they're supposed to run at
Rework node initialization and add nodeComputeInputBuffers

This involves defining a max block size, which is currently 1024.
Rewrite Lav_processDefault to use new input system
Rewrote parent-child configuration to use new input system
Add missing call to nodeComputeInputBuffers
Rewrite node processing to use new input interface
Redirect graph processing function to the new node reader
Update file node to new input system
Update sine node to the new input interface
Update mixer
Update hrtf node