Disabled gadget events

[nblackburn]

I feel it would be a good idea to allow disabled gadgets to continue sending/receiving certain events but in a more restricted manor.

For example the editor would be able to receive #PB_EventType_Change when it's disabled so you can continue checking if it's content was changed instead of manually having to issue a event when this happens.

[Fred]

Events are sent when the user acts on the gadget, not when done programmatically. You can't have any event on a disabled gadget as the user can't use it.