Add possiblity to set up screenshot directory

There is a really handy keyword in a similar library (😉) which is Set Screenshot Directory. In BrowserLibrary it’s possible to set the path to the screenshot explicitly in path argument when using Take Screenshot keyword but when the screenshot is taken for failed test the keyword is run through the default import parameter run_on_failure which does not support providing directory. I would like to be able to set the directory for all the screenshots and by default they should land in ${OUTPUT DIR} in my opinion. Would be nice to have similar keyword like Set Screenshot Directory here also.

[mnojek]

Thanks @mkorpela for the changes. They are definitely needed but I still see the lack of one useful feature. I would still like to have a way to set up a directory for screenshots globally, not only when taking screenshots explicitly. By default the import parameter run_on_failure takes Take Screenshot keyword, but I cannot edit the place where I want them to be put. That I would like to control.

[aaltat]

I guess we will close it, there has been enhancements on the area and need may not exist anymore. We can re-open this one or create new one.