Created & applied new event_object type (#109)

Created new event type.
some components only allow for an event to be an object, not a string
Co-authored-by: Daan Verstraten <daanverstraten@hotmail.com>

source/behavior/entities/format/components/leashable.json

@@ -24,12 +24,12 @@
       "title": "Maximum Distance"
     },
     "on_leash": {
-      "$ref": "../types/event.json",
+      "$ref": "../types/event_object.json",
       "description": "Event to call when this entity is leashed.",
       "title": "On Leash"
     },
     "on_unleash": {
-      "$ref": "../types/event.json",
+      "$ref": "../types/event_object.json",
       "description": "Event to call when this entity is unleashed.",
       "title": "On Unleash"
     },