- many minor python improvements (ichunjo)
- the api r3 headers are no longer distributed with the windows binaries, general api r3 support for plugins remains for now
- vsscript r3 api support has been completely removed since nobody has used it for 3+ years
- fixed mirroring at edges in convolution filters to be more consistent
- fixed cache state not being updated properly for nodes with no consumers ever and no calls to setcache