-Added compatibility with 1.21.8.
-Added %servervariables_initial_value_<variable>% PlaceholderAPI variable.
-Added update_notify option in the config to enable/disable join notifications when there is a new version.
-Added new methods to the API.
-Fixed and updated some dependencies
-Fixed API issues.
-Added max characters length limitation for variables.
-Modified PlaceholderAPI variable %servervariables_value_otherplayer_<player><variable>% to %servervariables_value_otherplayer<player>:<variable>%
-Modified PlaceholderAPIvariable %servervariables_display_otherplayer_<player><variable>% to %servervariables_display_otherplayer<player>:<variable>%