add hacky workaround for hot reloaded assets and clear scene on initialize

ios/Classes/SwiftPolyvoxFilamentPlugin.swift

@@ -46,17 +46,53 @@ public class SwiftPolyvoxFilamentPlugin: NSObject, FlutterPlugin, FlutterTexture
 
       var path:String? = nil
       
+      let appFolder = Bundle.main.resourceURL
+      let dirPaths = NSSearchPathForDirectoriesInDomains(.applicationDirectory,
+                    .userDomainMask, true)
+      let supportDirPaths = NSSearchPathForDirectoriesInDomains(.applicationSupportDirectory,
+                    .userDomainMask, true)
+      let devFsPath = URL(fileURLWithPath: supportDirPaths.first!, isDirectory:true).deletingLastPathComponent().deletingLastPathComponent().appendingPathComponent("tmp")
+      
+      var found : URL? = nil
+
+      let orderedURLs = try? FileManager.default.enumerator(at: devFsPath, includingPropertiesForKeys: [ .pathKey, .creationDateKey], options: .skipsHiddenFiles)
+      for case let fileURL as URL in orderedURLs! {
+        if !(fileURL.path.hasSuffix(uriString)) {
+          continue
+        }
+        if found == nil {
+          found = fileURL
+        } else {
+          do {
+            let c1 = try found!.resourceValues(forKeys: [.creationDateKey]).creationDate
+            let c2 = try fileURL.resourceValues(forKeys: [.creationDateKey]).creationDate
+            if c1! < c2! {
+              found = fileURL
+            }
+          } catch {
+            
+          }
+        }
+      }
+      
+      if found != nil {
+        path = found?.path
+        print("FOUND \(found)")
+      } else {
         if(uriString.hasPrefix("file://")) {
           path = String(uriString.dropFirst(7))
         } else {
           let key = instance.registrar.lookupKey(forAsset:uriString)
           path = Bundle.main.path(forResource: key, ofType:nil)
+          print("Found path \(path) for uri \(uriString)")
           guard path != nil else {
             print("File not present in bundle : \(uri)")
             return ResourceBuffer()
           }
         }
+      }
       do {
+        print("Opening data from path \(path)")
         let data = try Data(contentsOf: URL(fileURLWithPath:path!))
         let resId = instance.resources.count
         let nsData = data as NSData
@@ -128,6 +164,13 @@ public class SwiftPolyvoxFilamentPlugin: NSObject, FlutterPlugin, FlutterTexture
   
     private func initialize(width:Int32, height:Int32) {
 
+      if(self.viewer != nil) { 
+        clear_assets(self.viewer)
+        clear_lights(self.viewer)
+        destroy_swap_chain(self.viewer)
+        filament_viewer_delete(self.viewer)
+      }
+
       print("Initializing with size \(width)x\(height)")
 
       createPixelBuffer(width:Int(width), height:Int(height))