This patch adds 1220 photographic avatars in order to finish work on T9910.
Sylistically they are simple and with only a single topic in focus.
Sizes are 512x512, the formats .png. They've been tested with our circular avatar template and cropped to fit it well.
SizesAll are 512x512, the formats .pngcrops of strictly CC0 licensed images from Pexels. They've tested with our circular avatar template and cropped to fit it wellLicense information has also been supplied.
Closes T9910