[C] Add missing HangingBreakEvent. Addresses BUKKIT-3943

#### The Issue:
Currently, no HangingBreakEvent is fired when Hanging entities are knocked down by lightning.

#### Justification for this PR:
The old PaintingBreakEvent is fired here, and in all other places this deprecated event is fired alongside the new HangingBreakEvent. It only makes sense that one should be fired here as well.

#### PR Breakdown:
This PR adds a call to HangingBreakEvent when Hanging entities are knocked down by lightning.

#### Relevant PR(s):
This PR addresses a similar but different issue with the HangingBreakEvent - https://github.com/Bukkit/CraftBukkit/pull/1041

#### JIRA Ticket:
BUKKIT-3943 - https://bukkit.atlassian.net/browse/BUKKIT-3943