[Feature Request] Blacklist song titles / keywords

[medeirosT]

Please tick all applicable boxes.

• [x] I am using Python 3.5.3 or higher (run python --version on the command line)
• [x] I have followed the official guides to install the bot for my system
• [x] I have updated my dependencies to the latest version using the appropriate update script

Which version are you using?

• [x] The latest master version (release-260419)
• [ ] The latest review version

What type of issue are you creating?

• [ ] Bug
• [x] Feature request
• [ ] Question

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Description of issue

The possibility of blacklisting keywords from searches or found song names

Some users are abusing the bot playing offensive videos/songs. Would be nice to block certain keywords to forbid some stuff from playing as a configurable option