The signed RDP files generated by RemoteAll Tool use UTF-16 LE instead of UTF-8. We should add support for parsing this encoding when fetchching RDP file contents in getAppsAndDesktops().

This will also enable better handling for signed RDP files; we can look at the signature property instead of detecting lots of null bits from the UTF-16 encoding. Related to #57 and #58. I did not realize the UTF-16 encoding was causing the 0 bytes when I made PR #58, but the assumption I made that only signed RDP files are like this is wrong and could lead to issues in the future.