changed persistence configuration for entities, so cascade is more correct
changed the way channels get their server assigned
added feature to only change the exp role of a user, if he doesn't already have the new target role
added the name of the needed feature, to the message indicating that a feature has been disabled
updated unsetExpRole to have a status update message, because there might be a lot of users which need a role update
added command to remove a role from the experience roles
added leaderboard command
added rank command
fixed missfire configuration for cron jobs (they should not be executed)
added ability to configure recovery for jobs
added tracking of message count
added join listener to automatically give the appropriate role for a joined user
added parameter to join listener containing the userInAServer
re-added command exception templates
added method to create a status message (basically only a single message is returned and expected)
added method to edit a single message in a channel to channel service
fixed cases in which there are no embeds, but we still used the embed principle of sending messages (only text was send)
added more functions to channel service to send messages with
moved joined listeners to their separate transaction
includes: set role command to set a role to a given level (it clears out previous levels)
automatic level config generation on startup
min/max/multiplier configuration
job to persist the xp of the previous minute
added delayed scheduler start, so that events have a discord context in order to function
added role listener to automatically add and mark roles when they are created/deleted
fixed user in a server not being created correctly
added role service to give users role given by id
added server reference to role
