whirl-pinch: use gegl-op.h
mosaic: add property meta-data
unsharp-mask: add property meta-data
value-invert: use gegl-op.h
write-buffer: use gegl-op.h
wind: use gegl-op.h
waves: add property meta-data
weighted-blend: use gegl-op.h
tile-seamless: use gegl-op.h
tile: add property meta-data
texturize-canvas: use gegl-op.h
svg-saturate: use gegl-op.h
svg-matrix: use gegl-op.h
svg-luminancetoalpha: port to op.h, remove unused property
svg-huerotate: use gegl-op.h
stretch-contrast: use gegl-op.h
stress: add property meta-data
softglow: add property meta-data
snn-mean: add property meta-data
save: port to gegl-op.h