Prototype plugin architecture, switch instance-based stuff to that

src/rbx.rs

@@ -0,0 +1,18 @@
+use std::collections::HashMap;
+
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RbxItem {
+    pub name: String,
+    pub class_name: String,
+    pub children: Vec<RbxItem>,
+    pub properties: HashMap<String, RbxValue>,
+}
+
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase", tag = "type")]
+pub enum RbxValue {
+    String {
+        value: String,
+    },
+}