Event Manager: Handle name/description change floods
Event Manager: Handle name/description change floods

Mainly needed for web content during page (re)loads.

* Include name and description changes to the flood types we handle
* Use any busy-changed event as an opportunity to prune spammy events
* Check if pruning is needed during processing object events; not just
  when enqueueing them

GNOME/orca,GNOME/orca,GNOME/orca,GNOME/orca