reprostim-screencapture experiences and desired options

[yarikoptic]

I was trying it out on reproiner to collect screenshots to update our docs. While working with it felt we need

• it seems we lack docs on what config file should it be
• we might want to change name for config from config.yaml since that one is per single device and we need to choose different one from video capture. Invocation I used was reprostim-screencapture -d . -o screens -c screencapture-config.yaml -v
• output folder should be screens/ not Screens/ by default (casing just adds undesired variability IMHO in such cases)
• option on number of screenshots to take (e.g. 3 or so would be enough for me if not even just 1) and exit
• "name" so could be used in addition or instead of datestamp folder . Approach could be similar to duct output filenaming which would be a template so we could insert datestamp + desired name. So smth like screens/{datetimerange_filesafe}/{datetime_filesafe}.png would be current one but I could say screenshots/01-welcome-screen/{index%02d}.png and so on
• option to list resolution while listing devices if possible
• edit: some setting which would define the change threshold upon which to save a new image (we might have config already?)