Removed a leftover debug message
Fixed an error with the 'on gamemode change' event
Removed a warning if there are no variables in the variables.csv
The damage in damage events is still the raw damage, i.e. without any armour/critical/enchantment modificators applied.
If no world is specified in a periodical event no errors are printed if one uses the event-world (e.g. by using 'time' instead of 'time of <world>'), but it will fail silently when the script is executed.