decomp3: decompile remaining mission code (#3515)

This should make all missions playable with the exception of the end of
`precursor-destroy-ship` because `precurd` asserts on level extraction.

- `trail`
- `trail-graph`
- `wastrail-graph`
- `cty-protect`
- `protect-gunship`
- `protect-path`
- `protect-script`
- `assault-cams`
- `assault-enemies`
- `assault-path`
- `assault-script`
- `assault-shared`
- `assault-task`
- `hover-nav-precura`
- `precura-mood`
- `precura-obs`
- `precura-obs2`
- `precura-part`
- `precurc-mood`
- `precurc-obs`
- `precurc-part`
- `precurd-obs`
- `precurd-part`
- `precurd-scenes`

decompiler/util/data_decompile.cpp

@@ -1044,9 +1044,29 @@ const std::unordered_map<
                {"anim2", ArrayFieldDecompMeta(TypeSpec("tpath-control-frame"), 16)},
                {"anim3", ArrayFieldDecompMeta(TypeSpec("tpath-control-frame"), 16)}}},
              {"blow-tower-path",
-              // TODO - should be able to just decompile the `anims` field
               {{"pts", ArrayFieldDecompMeta(TypeSpec("vector"), 16)},
                {"node-info", ArrayFieldDecompMeta(TypeSpec("blow-tower-node-info"), 32)}}},
+             {"trail-conn-hash",
+              {{"cell", ArrayFieldDecompMeta(TypeSpec("trail-conn-hash-cell"), 6)},
+               {"conn-ids", ArrayFieldDecompMeta(TypeSpec("uint16"),
+                                                 2,
+                                                 ArrayFieldDecompMeta::Kind::REF_TO_INTEGER_ARR)}}},
+             {"trail-graph",
+              {{"node", ArrayFieldDecompMeta(TypeSpec("trail-node"), 20)},
+               {"conn", ArrayFieldDecompMeta(TypeSpec("trail-conn"), 8)},
+               {"conn-ids", ArrayFieldDecompMeta(TypeSpec("uint16"),
+                                                 2,
+                                                 ArrayFieldDecompMeta::Kind::REF_TO_INTEGER_ARR)},
+               {"visgroup", ArrayFieldDecompMeta(TypeSpec("trail-conn-hash-cell"), 6)},
+               {"blocker", ArrayFieldDecompMeta(TypeSpec("trail-blocker"), 32)},
+               {"visnode-ids",
+                ArrayFieldDecompMeta(TypeSpec("uint16"),
+                                     2,
+                                     ArrayFieldDecompMeta::Kind::REF_TO_INTEGER_ARR)},
+               {"cell-pov-bit-arrays",
+                ArrayFieldDecompMeta(TypeSpec("uint64"),
+                                     8,
+                                     ArrayFieldDecompMeta::Kind::REF_TO_INTEGER_ARR)}}},
          }}};
 
 goos::Object decompile_structure(const TypeSpec& type,