fix: sprite artifacts 2 (#1044)

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: 
    ```yaml
    tiles:
    - pos:
      - 1
      - 2
      idx: 3
      collision: Solid
    ```
    After:
    ```yaml
    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:

    ```yaml
    # 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)

.gitattributes

@@ -5,7 +5,7 @@ web/* linguist-vendored
 
 # Explicitly declare text files you want to always be normalized and converted
 # to native line endings on checkout.
-*.{txt,md,rs,py,js,jsx,ts,tsx,css,scss,html,xml,json,yaml,yml,toml} text
+*.{txt,md,rs,lua,py,js,jsx,ts,tsx,css,scss,html,xml,json,yaml,yml,toml} text
 
 # Declare files that will always have LF line endings on checkout.
 *.sh text eol=lf
@@ -17,11 +17,14 @@ web/* linguist-vendored
 # Denote all files that are truly binary and should not be modified.
 *.{png,jpg,jpeg,gif,ico,webp,woff,woff2,ttf,otf,eot,mp3,mp4,wav,webm,ogg} binary
 
-# Treat all files in the assets directory as binary
+# Treat all files in the assets directory as binary (except text files)
 assets/** binary
 old_assets/** binary
-
-*.ftl diff
+*.txt -binary
+*.lua -binary
+*.yml -binary
+*.yaml -binary
+*.ftl -binary
 
 # If you have other directories with mostly binary files, add them like this:
 # other_binary_directory/** binary

assets/map/levels/level_1.map.yaml

@@ -1022,22 +1022,22 @@ layers:
   - pos:
     - 9
     - 9
-    idx: 23
+    idx: 24
     collision: Empty
   - pos:
     - 10
     - 9
-    idx: 24
+    idx: 25
     collision: Empty
   - pos:
     - 16
     - 9
-    idx: 24
+    idx: 25
     collision: Empty
   - pos:
     - 17
     - 9
-    idx: 25
+    idx: 26
     collision: Empty
   elements:
   - pos:
@@ -1125,12 +1125,12 @@ layers:
   - pos:
     - 9
     - 7
-    idx: 20
+    idx: 9
     collision: Empty
   - pos:
     - 17
     - 7
-    idx: 20
+    idx: 9
     collision: Empty
   elements: []
 - id: platforms
@@ -1139,62 +1139,62 @@ layers:
   - pos:
     - 11
     - 4
-    idx: 41
+    idx: 52
     collision: JumpThrough
   - pos:
     - 12
     - 4
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 13
     - 4
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 14
     - 4
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 15
     - 4
-    idx: 43
+    idx: 54
     collision: JumpThrough
   - pos:
     - 10
     - 16
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 11
     - 16
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 12
     - 16
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 13
     - 16
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 14
     - 16
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 15
     - 16
-    idx: 42
+    idx: 53
     collision: JumpThrough
   - pos:
     - 16
     - 16
-    idx: 42
+    idx: 53
     collision: JumpThrough
   elements: []
 - id: items