Date dependent path added for selenium screenshots

[dosas]

Currently for selenium screenshots a folder consisting of the current date is created, IMHO this should be removed for the following reasons:

• The screenshot path is provided by the setting settings.selenium.screenshots_path which is kind of overwritten/extended byt his and makes it impossible to reference this setting elsewhere (CI, pytest, ...)
• Everything that is date dependent makes problems in a CI system: Imagine running the tests around midnight then you get two folders for one testrun
• The date is already added in the screenshot filename, so this information is duplicated

Further more a setting to not have the datetime in the screenshot file name could be added.

Also the name screenshot in a file name inside a screenshot directory does not make sense to me.