RBTray prevents users from deleting/renaming the program folder

## The problem

After users run [start-taking-screenshots](https://github.com/felladrin/windows-timelapse-toolkit/blob/0d1bfe84552b46d3950326d849f46613629ab779/start-taking-screenshots.bat) they are not able to delete/rename the folder (until they restart the computer) due to RBTray running in the background.

So for them to be able to delete/rename that folder (without needing to restart the computer), they need to end RBTray task through the Task Manager:

## The task

Find a way to end RBTray when a user terminates the [start-taking-screenshots](https://github.com/felladrin/windows-timelapse-toolkit/blob/0d1bfe84552b46d3950326d849f46613629ab779/start-taking-screenshots.bat) script.

Start with start-taking-screenshots.bat and trace how RBTray is launched and what happens when the script is terminated. Confirm the folder can be deleted or renamed after termination without restarting Windows, and verify screenshot capture still works.

Written by the indexing model from the issue text.