GiD_Event_AfterCreateLayer: will be called just after create the layer 'name'
GiD_Event_AfterRenameLayer: will be called just after the layer 'oldname' has been renamed to 'newname'
GiD_Event_BeforeDeleteLayer / GiD_Event_AfterDeleteLayer: will be called just before /after delete the layer 'name'
If GiD_Event_BeforeDeleteLayer returns -cancel- the layer deletion is cancelled.
GiD_Event_AfterChangeLayer: will be called just after change some property of the layer 'name'
- property' could be ON, OFF, FROZEN, UNFROZEN, ALPHA <AAA>, COLOR <RRRGGGBBB?AAA?>
with RRR, GGG, BBB, AAA from 0 to 255
GiD_Event_AfterChangeParentLayer: will be called when moving a layer to another parent of the tree.
GiD_Event_AfterSetLayerToUse: will be called when setting 'name' as current layer to use
GiD_Event_AfterSendToLayer: will be called when changing entities to the layer 'name'