Bump copyright year in header comments

Author: delphidabbler

Src/CodeSnip.dpr

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at http://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2005-2020, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2005-2021, Peter Johnson (gravatar.com/delphidabbler).
  *
  * CodeSnip application project file.
 }

Src/FmSplash.pas

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at http://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2007-2020, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2007-2021, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Implements the program's splash screen.
 }

Src/Res/HTML/dlg-about-program-tplt.html

@@ -9,7 +9,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at http://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2005-2020, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2005-2021, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Template for content displayed in program tab of about dialog box.
 -->

Src/UClassHelpers.pas

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at http://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2012-2020, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2012-2021, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Provides various class helpers for VCL classes.
 }

Src/UGIFImageList.pas

@@ -3,7 +3,7 @@
  * v. 2.0. If a copy of the MPL was not distributed with this file, You can
  * obtain one at http://mozilla.org/MPL/2.0/
  *
- * Copyright (C) 2008-2020, Peter Johnson (gravatar.com/delphidabbler).
+ * Copyright (C) 2008-2021, Peter Johnson (gravatar.com/delphidabbler).
  *
  * Image list descendant that enables representations of GIF images loaded from
  * HTML resource to be added. Resource names are mapped to image indices.