LiBot 5.0.6

Changes:
* Migrate to JDA 5.0.0
Fixes:
* [module-games] Fix issues with *akinator
* [module-utilities] Fix boolean display for *calc
* [module-utilities] Fix planet() and atom() for *calc
* [module-music] Fix YouTube playback
* [module-customization] Fix a bug in *greeter
Removals:
* [module-utilities] Remove *poll because Discord now supports polls
natively.
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