Fix seeding notifications

Fixed seeding notifications after the server emptying, replaced the release shell script with a Go "script". Use go run cmd/build.go to build and pack all binaries.

Stop spam

The bot won't send the same message over and over now if the number of players is fluctuating between two states.

TLS cache optimization

This is not an issue on fast x86 platforms but on ARM and MIPS cryptography is expensive (due to some missing native instructions like division) and TLS connection to Discord uses ECDSA. In practice this means about 3.5 seconds required to establish it and it has to be done again if the bot was idle (i.e. hasn't send a message for a while). Using a TLS session cache allows to instantly resume the session without expensive calculations.

Commands & skills

Added -help and -status commands, added displaying average skill and map on the server

Initial release

Initial release with mostly working basic features