RPA.Word/Excel/Outlook.Application general fixes

[cmin764]

• Check if path is existing before opening a document (raise exception when missing).
• Check if generating existing output will replace the file, otherwise make it happen.
• Ensure that atexit registration really works on Windows service Worker.
• Common harmonized catch_com_error utility in order to catch errors happening during the operations.
• Check out Outlook error.
• Ensure that close_document() will close the document when it wasn't closed already, even if the app is still open.
• Add notice docs on enabling RDP when running on custom Windows service Worker, so these apps will work.