only warn about mismatching audio properties if started without audio,
add alpha channel support to livido,
renamed a FX,
added mixtoalpha,alphafill,alpha2img,toalpha,alphaflatten,
handle alpha plane,
vims 048 enables full sub-chain render incl. mixing effects,
support livido generator plugins as solid color tags (only used if configured)
added livido plugins. use RUNME.sh to compile .so objects to path configured in plugins.cfg