Adding different versions of the eggshell hat
Adding an annual Easter event.
fixup space.
message the player if timer has not yet expired.
prevent low level players from annual easter.
Modifications on the Easter event after testing with a group of people:

- add message when you find something in a nest
- add message when you get the unique reward
- increase number of relocations
- reduce the time penalty after checking a nest from 30 to 15 seconds
- change behavior when checking a nest during the penalty time
-- message should make it more clear that it's needed to wait a while
-- extend the time penalty for a few seconds
Introduce a non-permanent counter of tries.

The counter gets reset on log out.
The probability to get the final reward depending on the counter.
Merge branch 'easter'

Conflicts:
	world/map/db/item_db.txt