Add world events: on flag cleared, on npc flag cleared, on player flag cleared, on server flag cleared, on player flag [flag_name] cleared, on npc flag [flag_name] cleared, on server flag [flag_name] cleared, on flag changed, on npc flag changed, on player flag changed, on server flag changed, on npc flag [flag_name] changed, on server flag [flag_name] changed, on player flag [flag_name] changed, with contexts <context.old_value>, <context.owner>, <context.type> and <context.name>
Temp. fix to NPE in FOLLOW command.
Make /ex use the selected npc for context.