Inventory: Add exclamation mark in HUD to indicate updates

[manuq]

In #2354 the inventory will be updated with hints for quests. We should let the player know when this information is updated. Proposal: do it with an exclamation mark in the HUD.

Example:

1. StoryWeaver talks with Lore Elder
2. Lore Elder gives the hint in dialogue "Please go to the Song Sanctuary and find the Musician. It's north-east of here."
3. This line is added to the quest log in the inventory: "Find the Musician in the Song Sanctuary" (or even the one above, verbatim?)
4. An (!) icon appears next to the HUD. A sound effect should be played as well.
5. The player goes to check the inventory. Then goes back to the game.
6. The (!) icon is dismissed.

Number 3 is out of scope (tracked in #2354). Number 4 and 6 should be implemented in this issue.

XP Summary (total 475)

Subdomain	Skill	XP
Engineering: Gameplay & Systems Programming	Problem Solving	75
Engineering: Gameplay & Systems Programming	Creativity & Design Thinking	75
Engineering: Gameplay & Systems Programming	Technical Literacy	150
Art: Aesthetics & Visual Design	Problem Solving	50
Art: Aesthetics & Visual Design	Creativity & Design Thinking	75
Art: Aesthetics & Visual Design	Technical Literacy	50