Add Pixiv user search using 'user:ID' (fix #1950)
Add Pixiv user search using 'user:ID' (fix #1950)

Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber,Bionus/imgbrd-grabber