Relicense layout definitions under CC0 (#528)

* Relicense layouts under CC0

Layout definitions are licensed differently from the rest of the
application source code to allow use in other projects related or
unrelated to Unexpected Keyboard.

Some layouts are not re-licensed and their original copyright continues
to apply. The copyright notice is added at the top of the files.

* Contributing: Mention layout licensing

CONTRIBUTING.md

@@ -110,6 +110,10 @@ Run `./gradlew checkKeyboardLayouts` to check some properties about your
 layout. This will change the file `check_layout.output`, which you should
 commit.
 
+Layouts are CC0 licensed by default. If you do not want your layout to be
+released into the public domain, add a copyright notice at the top of the file
+and a mention in `srcs/layouts/LICENSE`.
+
 #### Adding a programming layout
 
 A programming layout must contain all ASCII characters.

build.gradle

@@ -180,6 +180,7 @@ tasks.register('copyLayoutDefinitions')
 {
   copy {
     from "srcs/layouts"
+    include "*.xml"
     into "build/generated-resources/xml"
   }
 }

srcs/layouts/LICENSE

@@ -0,0 +1,134 @@
+Layout definitions are licensed differently from the rest of the application
+source code to allow use in other projects related or unrelated to Unexpected
+Keyboard.
+
+The following license applies to all the files in the srcs/layouts directory
+whose name ends in .xml with the exception of:
+
+- latn_neo2.xml
+- latn_qwertz.xml
+
+Files listed as exceptions are licensed under the same license as the rest of
+the project and might contain copyright notices.
+
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
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srcs/layouts/latn_neo2.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- copyright 2022 matthiakl <t-m.42@mailpost.spdns.org> -->
 <!-- https://neo-layout.org/Layouts/neo/ -->
 <keyboard name="Neo 2" bottom_row="false" script="latin">
   <row>

srcs/layouts/latn_qwertz.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?> 
+<!-- copyright 2022 Moini <Moini@users.noreply.github.com> -->
 <keyboard name="QWERTZ" script="latin">
   <row>
     <key key0="q" key2="1" key4="esc"/>