sorcery: Add additional observer capabilities.

sorcery: Add additional observer capabilities.

Add new global, instance and wizard observers.
instance_created
wizard_registered
wizard_unregistered
instance_destroying
instance_loading
instance_loaded
wizard_mapped
object_type_registered
object_type_loading
object_type_loaded
wizard_loading
wizard_loaded

Tested-by: George Joseph
Review: https://reviewboard.asterisk.org/r/4215/
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Merged revisions 428999 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 429000 from http://svn.asterisk.org/svn/asterisk/branches/13

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@429001 65c4cc65-6c06-0410-ace0-fbb531ad65f3