Add hub areas to start quests

[wjt]

We will change the way that the player embarks on LoreQuests. Rather than picking a quest from a book, the player walks to a "hub area" and interacts with an NPC/walks down a path to start a quest.

Crude sketch here and exported for posterity:

[wjt]

Some of this can be extracted from #2046

[manuq]

I like that some quests can be done in different order and that solving music puzzles trigger the quests.

I understand that the tutorial quest leaves the player at the south-west of Fray's End, as today. And that you can't go back upon completing it.

What about creating a quest that is gated behind completing a void quest and a song sanctuary quest? One that uses both repel and grapple? Just an idea. Before, we brainstormed about a quest that can only be reached by obtaining the repel + grapple abilities, but now the tutorial gives them directly.

[wjt]

I think that's a great idea. Technically speaking, we should be able to do it with the QuestProgressUnlocker and a little bit of dialogue from an NPC standing around in one of the locations. Or maybe in order to cross an area of Song Sanctuary East, you need to have completed the musician quest (to get to SSE in the first place) and the void quest (to get the longer thread).