Fixing a bug with statistics

Fixed bug in support of older versions.
Now available server version 1.16.5 -> 1.21.4
Updated rewards gui interface.
Added /bp pass reload command

Now the plugin can be used with a lower version of java, namely 16

Changes:
Update core to 1.21.4

Changes:
The plugin now supports java from 17
Now the plugin can be used from the version of minecraft 1.18-1.21.3
Optimization of libraries.