refactor JATE to Standard Directory Layout

[jerrygaoLondon]

JATE needs to be refactored to conform to Standard Directory Layout so as to allow unit test.

/resource may be considered to be moved to src/main/resource so that resources can be packaged in jar.

see also the source directory config in build config in pom.xml

Recommended practice for package hierarchy is introduced in https://maven.apache.org/guides/introduction/introduction-to-the-standard-directory-layout.html

[jerrygaoLondon]

fixed. The package hierarchy is updated.