Update project configuration and snapshot files

- Changed the default project file from `plugin.project.json` to `plugin.project.json5` in `build.rs`.
- Added new project configuration files in JSON5 format for various test cases, including `default.project.json5`, `client_in_folder`, `csv_bug_145`, and others.
- Updated snapshot files to reflect changes in instance structure and properties, ensuring consistency with the new project configurations.
- Removed unnecessary script and module instances from snapshot files to streamline the testing process.

rojo-test/build-tests/unresolved_values/default.project.json5

@@ -0,0 +1,49 @@
+{
+  "name": "unresolved-values",
+  "tree": {
+    "$className": "DataModel",
+
+    "Lighting": {
+      "$properties": {
+        "Technology": "Voxel",
+        "Ambient": [1, 0, 0]
+      }
+    },
+
+    "Workspace": {
+      "Color": {
+        "$className": "Part",
+        "$properties": {
+          "Color": [0.5, 0.25, 0],
+          "CFrame": [
+            1, 2, 3,
+            0, 1, 0,
+            0, 0, 1,
+            1, 0, 0
+          ]
+        }
+      },
+
+      "Bool": {
+        "$className": "BoolValue",
+        "$properties": {
+          "Value": true
+        }
+      },
+
+      "Int": {
+        "$className": "IntValue",
+        "$properties": {
+          "Value": 65
+        }
+      },
+
+      "Float": {
+        "$className": "NumberValue",
+        "$properties": {
+          "Value": 123.5
+        }
+      }
+    }
+  }
+}