fix: $121 - add support functionality that mirrors all private messages sent to the bot to a specified support channel, to be reviewd by a mod.

Added functionality, to add a new "Lerngruppen" voice channel, whenever somebody joins any of the existing ones and there is no empty voice channel in that category left.

Added text command functionality, that allows to add commands, that print simply print out text. And in case there are multiple texts for a command, one is chosen randomly. Also added command !add-motivation, that allows users to add specific texts for !motivation command. Those texts then have to be approved by a mod.

Added TOP functionality to add/remove TOPs on a channel basis, as well as list all TOPs from a channel. Also added help texts for those commands and added missing help text for !poll command.

Fixed fu-my-roles command, that was not working when sending the command from a discord server, instead of a DM

Added pin-bot functionality. Bot will now pin messages, when a pin reaction is set, or unpin a message, when all pin reactions are removed from this message.

Added activity that is shown in members list below the bots name and added a new command, that sends a link the discrod to share with others