TmTmc-ServerBasics

Rewrote most of the procedures and changed the behavior slightly.  Instead of opening a GUI with several pages worth of gamerules, instead I've introduced several new commands and removed the /openmenu option.  This will help porting the mod to Fabric soon.

/getrules - this will return all the current gamerules and their values

/setrules - this will update three gamerule settings that many find helpful when starting off.  keepInventory set to TRUE, doFireTick set to FALSE and doWeatherCycle set to FALSE.  This allows players to keep their inventory if they die in-game when they respawn.  The doFireTick prevents fire spreading and destroying everything in its path.  The doWeatherCycle will disable rain and storms so you can focus on the server setup.

/resetrules - opposite of /setrules to reset the above back to their defaults

Introduced a new configuration file which can be used to welcome players to your server and several others that will be used in future updates.  There is also an action that announces when new players have joined the server.  When the admin logs in, this is what they are presented with.

Updated to support Java 11 (recommended) and Forge 1.16.5 Build 36.2.0 or higher