Add improved FormatBytesCount to print large sizes in more detailed way

Instead of printing `2 GB` output `2.43 GB` to be more explicit.
Deprecate version with `int` in favor of a single `ulong`.

Source/Editor/Windows/Profiler/Assets.cs

@@ -52,7 +52,7 @@ namespace FlaxEditor.Windows.Profiler
                 AnchorPreset = AnchorPresets.HorizontalStretchTop,
                 Offsets = Margin.Zero,
                 Height = SingleChart.DefaultHeight,
-                FormatSample = v => Utilities.Utils.FormatBytesCount((int)v),
+                FormatSample = v => Utilities.Utils.FormatBytesCount((ulong)v),
                 Parent = mainPanel,
             };
             _memoryUsageChart.SelectedSampleChanged += OnSelectedSampleChanged;