refactor(utils): rename TasFrame to RawTasFrame and add new TasFrame class

- Renamed original TasFrame struct to RawTasFrame to reflect its role as raw binary data
- Added new TasFrame class with encapsulated fields and helper methods
- Added FpsConverter usage for time delta calculation
- Added conversion methods between RawTasFrame and TasFrame
- Added getter and setter methods for frame properties
- Updated key flag operations to use private field instead of public one
- Added new utility files FpsConverter.cs and TasMemory.cs to project

BallanceTasEditor/Utils/FpsConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BallanceTasEditor.Utils {
+    public static class FpsConverter {
+        public static float ToFps(float delta) {
+            if (delta <= 0f)
+                throw new ArgumentOutOfRangeException("invalid time delta (not positive)");
+
+            return 1f / delta;
+        }
+
+        public static uint ToFloorFps(float delta) {
+            return (uint)Math.Floor(ToFps(delta));
+        }
+
+        public static float ToDelta(uint fps) {
+            return ToDelta((float)fps);
+        }
+
+        public static float ToDelta(float fps) {
+            if (fps <= 0f)
+                throw new ArgumentOutOfRangeException("invalid fps (not positive)");
+
+            return 1f / fps;
+        }
+    }
+}