LiBot 5.2.0

Additions:
- [core] Messages can now be deleted by adding a wastebin reaction
Changes:
- [module-money] Add *leaderboard
- [module-money] Claiming the hourly reward is now done with *reward
- [module-games] SecureRandom is now used for sensitive RNG
- Long values are now allowed for bets and in *dice
- Most interactive commands now take any string ending with "exit" as
the exit instruction
- Providers now only store data if it has changed

Fixes:
- [module-music] Fix YouTube playback and search
- [module-money] *transfer can no longer be used to double-spend LiBot
cash
- [module-search] Fix *urbandictionary output
- [module-utilities] Fix a possible integer overflow in *dice
- Remove a dead repository from the build files - LiBot now builds
without manually inserting the dependency
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