Initial support for event callbacks

Add parser support for template rendering of events.
Also defines the EventBase and Event classes.
EventBase is parent of Event.

Change-I

Initial support for event callbacks

Add parser support for template rendering of events.
Also defines the EventBase and Event classes.
EventBase is parent of Event.

Change-Id: I6b07b415acf510a8437529095bd489c0af73ddf5
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>

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