Add AccountCreatedEvent

[renatomassaro]

Some handlers:

• StoryHandler to set up the first storyline step
• ServerHandler to set up player's server
• AccountHandler to send the verification email [1]

[1] - This one is TODO. In fact, the first two bullets (set up server and storyline) should be done only after the email is verified, so it would also have to have a AccountVerifiedEvent).

[renatomassaro]

Actually it already exists :joy: but needs some improvements

[renatomassaro]

EntityCreatedEvent was also implemented, since some handlers require that the entity (and mainframe) be set up before it can continue, so this event acts as a synchronization step.