Add PspPalette extension

src/PixiEditor/Models/IO/PaletteParsers/JascPalFile/JascFileParser.cs

@@ -1,5 +1,4 @@
 using System.IO;
-using PixiEditor.DrawingApi.Core.ColorsImpl;
 using PixiEditor.Extensions.Palettes;
 using PixiEditor.Extensions.Palettes.Parsers;
 
@@ -10,7 +9,7 @@ namespace PixiEditor.Models.IO.PaletteParsers.JascPalFile;
 /// </summary>
 internal class JascFileParser : PaletteFileParser
 {
-    private static readonly string[] _supportedFileExtensions = new string[] { ".pal" };
+    private static readonly string[] _supportedFileExtensions = new string[] { ".pal", ".psppalette" };
     public override string[] SupportedFileExtensions => _supportedFileExtensions;
     public override string FileName => "Jasc Palette";