added modmail with some simple features (chat between user and moderator), and initial server selection (currently allows all servers, and does not consider the modmail feature)
added the initial commands, not all of them hold logic currently
added some checks to not crash when a command has null configuration
changed systemconfig to also have a long value, because double is not fit for all cases
added locking mechanism, to effectively lock the whole table without using the ... proper locking mechanism (needs to be reviewed)
changed interface in channel service to be a message channel instead of a textChannel
changed starboard post to be a user in a server instead of only user
added caching configuration for 2nd level caching in hibernate
added command to clear hibernate caches
changed some interfaces so the api looks a bit more consistent (return the created/updated value)
split user management and user in server management
added try catch block to message received listener execution, to make them independent
moved some feature flag methods to the feature flag service bean instead of the management service, as they used the FeatureEnum directly
fixed feature disable text always rendering
removed some non embed logging
fixed message embed template
added exception logging to message embedding
fixed makeAffected role parameter
made command check name case insensitive
added name to parameter for decayAllWarnings
removed simple log from message edited listener
