Add more hairstyles to character randomizer

[wjt]

Threadbare has a character randomizer to create distinct NPCs from a small number of component parts. See it in action in game_elements/characters/components/character_randomizer_test.tscn.

Currently the character randomizer has five hairstyles:

We would like more! Some ideas:

• Add more long-haired hairstyles: perhaps a bun, or ponytail
• Add a receded hairline, where the front and top of the head have no hair while the rest has a short cut
• Wikipedia's List of hairstyles might be a good source of inspiration!

The way these are implemented is that there is a sprite sheet for each hairstyle in res://scenes/game_elements/characters/npcs/components/, and then a corresponding SpriteFrames in res://scenes/game_elements/characters/components/sprite_frames/, which are added to the RandomTextureSpriteBehavior in res://scenes/game_elements/characters/npcs/townie.tscn. The sprite sheets use three shades of orange, plus black. Then, in the game, a chroma-key shader replaces those three shades of orange with one of a number of alternative palettes. The sprite sheets are exported from a single Aseprite file at scenes/game_elements/characters/npcs/components/townie.aseprite.

So to add a new hairstyle:

1. Open scenes/game_elements/characters/npcs/components/townie.aseprite in Aseprite, Pixelorama or compatible software
2. Add a new hair layer
3. Draw a new hairstyle using the same four colours
4. Export the spritesheet
5. Add a SpriteFrames
6. Update townie.tscn to include it in the randomized choices

@manuq created the existing assets & the game system that uses them, so he is the best person to ask for pointers!

XP Summary (total 450)

Subdomain	Skill	XP
Art: Animation & Effects	Problem Solving	150
Art: Animation & Effects	Creativity & Design Thinking	150
Art: Animation & Effects	Technical Literacy	150