fix: sprite artifacts 2

[nelson137]

Follow-up to #1041.

Changes

• Fix the rest of the sprite artifacts in ship_decorations

Things Worth Mentioning

• Changed levels 3 & 8 to use YAML flow style so that I could find tiles by position (e.g. by searching for pos: [13, 10]:

  Before:

  tiles:
  - pos:
    - 1
    - 2
    idx: 3
    collision: Solid

  After:

  tiles:
  - { pos: [1, 2], idx: 3, collision: Solid }

• Add script to get the layer names in any level files that use specific tile indexes of a tilemap:

  # Find all crow's nests (indexes 30-32) from ship_decorations
  $ ./scripts/find-atlas-tiles.sh ship_decorations.atlas.yaml '[30,31,32]'
  
  ./assets/map/levels/level_3.map.yaml
  - foreground
  
  ./assets/map/levels/level_8.map.yaml
  - foreground
  
  # This tells us levels 3 and 8 have crow's nests in their "foreground" layer

• Fix git attributes for text files in assets/ & old_assets/ which shouldn't be treated as binary (yaml, txt, ftl)

[MaxCWhitehead]

Sorry fixing this up is so painful - need to get the level editor back in. Thanks!