Renamed jaxb-api directory to api. (#198)

Signed-off-by: Tomas Kraus <tomas.kraus@oracle.com>

CONTRIBUTING.md

-[//]: # " Copyright (c) 2018, 2020 Oracle and/or its affiliates. All rights reserved. "
+[//]: # " Copyright (c) 2018, 2021 Oracle and/or its affiliates. All rights reserved. "
 [//]: # "  "
 [//]: # " This program and the accompanying materials are made available under the "
 [//]: # " terms of the Eclipse Distribution License v. 1.0, which is available at "

NOTICE.md

-[//]: # " Copyright (c) 2018, 2019 Oracle and/or its affiliates. All rights reserved. "
+[//]: # " Copyright (c) 2018, 2021 Oracle and/or its affiliates. All rights reserved. "
 [//]: # "  "
 [//]: # " This program and the accompanying materials are made available under the "
 [//]: # " terms of the Eclipse Distribution License v. 1.0, which is available at "

README.md

-[//]: # " Copyright (c) 2018, 2020 Oracle and/or its affiliates. All rights reserved. "
+[//]: # " Copyright (c) 2018, 2021 Oracle and/or its affiliates. All rights reserved. "
 [//]: # "  "
 [//]: # " This program and the accompanying materials are made available under the "
 [//]: # " terms of the Eclipse Distribution License v. 1.0, which is available at "

jaxb-api/exclude.xml → api/exclude.xml

 <!--
 
-    Copyright (c) 2013, 2020 Oracle and/or its affiliates. All rights reserved.
+    Copyright (c) 2013, 2021 Oracle and/or its affiliates. All rights reserved.
 
     This program and the accompanying materials are made available under the
     terms of the Eclipse Distribution License v. 1.0, which is available at

jaxb-api/src/main/java/jakarta/xml/bind/DataBindingException.java → api/src/main/java/jakarta/xml/bind/DataBindingException.java

 /*
- * Copyright (c) 2006, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2021 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at

jaxb-api/src/main/java/jakarta/xml/bind/DatatypeConverter.java → api/src/main/java/jakarta/xml/bind/DatatypeConverter.java

 /*
- * Copyright (c) 2003, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2021 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at

jaxb-api/src/main/java/jakarta/xml/bind/DatatypeConverterInterface.java → api/src/main/java/jakarta/xml/bind/DatatypeConverterInterface.java

 /*
- * Copyright (c) 2003, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2021 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at

jaxb-api/src/main/java/jakarta/xml/bind/Element.java → api/src/main/java/jakarta/xml/bind/Element.java

 /*
- * Copyright (c) 2003, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2021 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at

jaxb-api/src/main/java/jakarta/xml/bind/JAXBContextFactory.java → api/src/main/java/jakarta/xml/bind/JAXBContextFactory.java

 /*
- * Copyright (c) 2015, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2021 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at

jaxb-api/src/main/java/jakarta/xml/bind/JAXBPermission.java → api/src/main/java/jakarta/xml/bind/JAXBPermission.java

 /*
- * Copyright (c) 2007, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2021 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at