Added functionality to automatically URL encode the room name if required

[markwragg]

This PR is to address issue #4 to automatically handle room name encoding for the -room parameter.

Description

Uses the [system.web.httputility] class to perform a URLdecode (in case the user has already done URL encoding) and then re-encode it. Has a try catch around it so if the class is not available it will continue to work without having modified $room, but prints a warning. I'm not sure how backwards compatible [system.web.httputility] is, but its available on PS7 under MacOS.

Motivation and Context

Closes #4

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• I have added Pester Tests that describe what my changes should do.
• I have updated the documentation accordingly.

[markwragg]

I know the issue raised for this is really old, but I'm clearing down old issues in my name and it seemed like an easy one to implement in case it is of use to anyone. Note I don't personally still use Hipchat so i'm not able to perform any real world testing unfortunately.