- moved javadoc options from subprojects to root project
- removed "API" from titles in HTML files
- added subproject name and version to header and footer
- use links to Java 11 API
- Javadoc for components that implement extension interfaces are useless because they do not include default methods from the extension interface
- GUI builders do not recognize default methods from the extension interface and it is not possible to edit extension properties in GUI builder
- the idea of adding the extension interface to own components can be also achieved by changing superclass of own component
(issue #117)
- added version info to manifest
- added META-INF/LICENSE
- Java source/target compatibility now defined in single location
- defined source file encoding for java compiler