* typesafe catalog category events
Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

* use emit
Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

* rename events
Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>