GamemodeDetector

v1.7: added saying players' world

v1.6: added console commands

v1.5.2: fixed /gdc because I was to lazy to test it properly before

v1.5: added command to list all players in creative mode /gdc

v1.4: added permissions for seeing players' gamemodes on login

v1.3: updated to 1.2.5

v1.2: added permissions

v1.1: added commands

v1.0: initial release