* src/game/GameEvent.* renamed to src/game/GameEventMgr.* for consistence
* `game_event` now have new `holiday` field for store client side holiday id associated with game event
* Added new enum HolidayIds with existed at this moment holiday ids.
* New function "bool IsHolidayActive(HolidayIds id)" added accessabel from scripts for active holidays check.
Many thanks also to:
Balrok@github.com for long time updating.
Triply@github.com for great work in rewriting process.
All who I forget to name.
Signed-off-by: ApoC <apoc@nymfe.net>