Rewrite wave filter to be parallel-safe.
Rewrite wave filter to be parallel-safe.

It does this by using mlt_frame_unique_properties(). Also, it fixes a
problem not properly processing a source image.

mltframework/mlt,zzhhui/mlt,anba8005/mlt,wideioltd/mlt,zzhhui/mlt,zzhhui/mlt,wideioltd/mlt,wideioltd/mlt,zzhhui/mlt,mltframework/mlt,anba8005/mlt,wideioltd/mlt,ttill/MLT-roto,ttill/MLT-roto,ttill/MLT,ttill/MLT-roto,j-b-m/mlt,gmarco/mlt-orig,zzhhui/mlt,ttill/MLT-roto,xzhavilla/mlt,anba8005/mlt,siddharudh/mlt,gmarco/mlt-orig,ttill/MLT,siddharudh/mlt,anba8005/mlt,xzhavilla/mlt,siddharudh/mlt,ttill/MLT,j-b-m/mlt,ttill/MLT,ttill/MLT,xzhavilla/mlt,mltframework/mlt,siddharudh/mlt,ttill/MLT,mltframework/mlt,ttill/MLT-roto-tracking,j-b-m/mlt,wideioltd/mlt,mltframework/mlt,gmarco/mlt-orig,xzhavilla/mlt,wideioltd/mlt,ttill/MLT-roto-tracking,ttill/MLT-roto,mltframework/mlt,gmarco/mlt-orig,ttill/MLT-roto,ttill/MLT-roto-tracking,wideioltd/mlt,j-b-m/mlt,gmarco/mlt-orig,zzhhui/mlt,j-b-m/mlt,gmarco/mlt-orig,anba8005/mlt,siddharudh/mlt,ttill/MLT-roto-tracking,gmarco/mlt-orig,ttill/MLT-roto,mltframework/mlt,j-b-m/mlt,siddharudh/mlt,ttill/MLT-roto-tracking,gmarco/mlt-orig,siddharudh/mlt,j-b-m/mlt,ttill/MLT,wideioltd/mlt,anba8005/mlt,mltframework/mlt,wideioltd/mlt,ttill/MLT-roto-tracking,mltframework/mlt,anba8005/mlt,xzhavilla/mlt,xzhavilla/mlt,xzhavilla/mlt,ttill/MLT,j-b-m/mlt,xzhavilla/mlt,ttill/MLT-roto,siddharudh/mlt,ttill/MLT-roto-tracking,zzhhui/mlt,ttill/MLT-roto,zzhhui/mlt,zzhhui/mlt,mltframework/mlt,ttill/MLT,xzhavilla/mlt,anba8005/mlt,j-b-m/mlt,siddharudh/mlt,gmarco/mlt-orig,anba8005/mlt,j-b-m/mlt,ttill/MLT-roto-tracking,ttill/MLT-roto-tracking