[Event Scripter] Scripts and requests

[mgpai]

@MaybeGrimm: It is possible to add metadata to a file, using the script, as long as the external program and the target file supports it. The script just passes the relevant variables to the external program. If you want to use 'exiftool', make sure you are able to add the metadata manually via CLI. Then, in the script, modify the path to 'exiftool' and the 'parameters' if necessary.