[Quests] Support condition types "dmg" and "heal"

[Tzook]

These new conditions are now supported in the server.

To add a new quest with these conditions:
simply create a question condition with condition name "dmg" or "heal", and keep the field Type empty.

To read the current progress of the dmg/heal of a quest:
the character quest progress data looks like this:
"quests": { "progress": {...}, "done": {...}, "hunt": {...}, "ok": {...}, "dmg": { "questKey": 1337 }, "heal": { "questKey": 6969 } },
So for example, it can be accessed with "questsData["dmg"][quest.Key].AsInt".

The dmg and heal should also increase the quest progress in the client when receiving dmg/heal events that are caused by your id (let me know if you prefer a new event for the quest progress).