Standardize project to KDAB copyright policy

For entire project: remove year from the statement

.reuse/dep5

@@ -5,22 +5,22 @@ Source: https://www.github.com/KDAB/KDSingleApplication
 
 #misc source code
 #Files:
-#Copyright: 2019-2023 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+#Copyright: Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
 #License: MIT
 
 #misc documentation
 Files: README.md INSTALL.txt Changelog docs/api/*.html
-Copyright: 2019-2023 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+Copyright: Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
 License: MIT
 
 #misc config files
 Files: .clang-format .cmake-format.py .codespellrc .gitignore .gitreview .krazy .mdlrc .mdlrc.rb .pre-commit-config.yaml appveyor.yml docs/api/Doxyfile.cmake distro/*
-Copyright: 2019-2023 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+Copyright: Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
 License: MIT
 
 #artwork
 Files: docs/api/*.png
-Copyright: 2019-2023 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
+Copyright: Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]>
 License: MIT
 
 #3rdparty

LICENSE.txt

@@ -1,5 +1,5 @@
-KDSingleApplication is (C) 2019-2023, Klarälvdalens Datakonsult AB,
-and is available under the terms of the MIT license.
+KDSingleApplication is © Klarälvdalens Datakonsult AB and is available
+under the terms of the MIT license.
 
 See the full license text in the LICENSES folder.
 

README.md

@@ -21,7 +21,7 @@ See [INSTALL.txt](INSTALL.txt) for installation instructions using CMake.
 
 ## Licensing
 
-KDSingleApplication is (C) 2019-2023, Klarälvdalens Datakonsult AB, and is available
+KDSingleApplication is © Klarälvdalens Datakonsult AB and is available
 under the terms of the [MIT license](LICENSES/MIT.txt).
 
 Contact KDAB at <[email protected]> if you need different licensing options.

docs/api/footer.html

@@ -1,7 +1,7 @@
     <hr>
     <div style="float: left;">
       <img src="kdab-logo-16x16.png">
-      <font style="font-weight: bold;">&copy; 2019-2023 Klar&auml;lvdalens Datakonsult AB (KDAB)</font>
+      <font style="font-weight: bold;">&copy; Klar&auml;lvdalens Datakonsult AB (KDAB)</font>
       <br>
       "The Qt, C++ and OpenGL Experts"<br>
       <a href="https://www.kdab.com/">https://www.kdab.com/</a>