GitHub: Updated license headers (#16714)

Author: Lamparter

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2025 Files Community
+Copyright (c) 2018 - present Files Community
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

src/Files.App.SaveDialog/Files.App.SaveDialog.Win32.vcxproj

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--  Copyright (c) Files Community. Licensed under the MIT License.  -->
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|arm64">
@@ -472,4 +473,4 @@
 
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
 
-</Project>
+</Project>

src/Files.App.Server/Files.App.Server.csproj

@@ -1,4 +1,5 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<!--  Copyright (c) Files Community. Licensed under the MIT License.  -->
+<Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
         <OutputType>WinExe</OutputType>

src/Files.Core.SourceGenerator/Extensions/StringBuilderExtensions.cs

@@ -30,7 +30,7 @@ internal static StringBuilder AppendAutoGeneratedHeader(this StringBuilder sb, s
 		/// <returns>The <see cref="StringBuilder"/> instance with the appended license header.</returns>
 		internal static StringBuilder AppendLicenceHeader(this StringBuilder sb)
 		{
-			return sb.AppendLine($"// Copyright (c) {DateTime.Now.Year} Files Community")
+			return sb.AppendLine($"// Copyright (c) Files Community")
 				.AppendLine("// Licensed under the MIT License.");
 		}