LiBot 5.1.0

Additions:
- [core] A new parameter system has been introduced
(libot.core.argument.*)
- [core] A new command metadata system has been introduced
(libot.core.command.CommandMetadata). This replaces overriding Command's
methods.
- [module-search] *ud can display more results with the --index named
parameter
Changes:
- [module-music] *p is no longer an alias of *playing
- [module-utilities] *tti now takes the size as a named parameter --size
- [module-utilities] *purge no longer defaults to one message, now
requires a parameter
- [module-informative] *getroles has been moved to informative commands
- The project has been relicensed to AGPL-3.0-only
- Many smaller changes and fixes
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