Add daily random quests

[boraini]

• Each player gets a random quest if they didn't have one previously or if 24 hours has passed since the last issue.
• Random quests are written as classes which can leverage the randomobject package found in gameserver util.
• Quests are written in such a way that it can also deserialize the quests implemented in the Ruby server
• The handling of quests is backwards-compatible with the Ruby server (which is pretty clean in my opinion even if it uses a lot of lists, no matter what language is the server you have like a handful of JSON constructs after all).

For the configured quests to serialize, GameConfiguration should also deserialize YAML files starting with config-.

hardcoded-quests.json is not provided.

[boraini]

Right now the event is tracked with Inventory.addItem(…). It will instead be tracked in BlockMineRequest and Player.awardLoot(…)

[boraini]

Graptik and I think this can be merged.