[Feature Request] Add remove range command

[jerichosy]

Is your feature request related to a problem? Please describe. N/A

Describe the solution you'd like I would like a command that allows the user to remove a range of songs in the queue. The main difference between this feature and the skip command is that this feature would allow the user to set/format the queue and just forget about it, unlike the skip command where it has to be done each time a song ends.

Describe the basic flow/steps of using this feature How this feature would be used:

1. Queue a number of songs (like a playlist)
2. Use a command such as -removerange [start] [end]
3. Examples: -removerange 2 5, -remove range 2 5, -remove 2-5, -rr 2 5

Please check the following links to confirm that your feature has not already been requested:

• [x] https://github.com/jagrosh/MusicBot/labels/enhancement
• [x] https://github.com/jagrosh/MusicBot/wiki/Things-That-Won%27t-Be-Added

[michaeltwang]

I've opened a PR that adds a removerange command to MusicBot.