dev-java/java-dep-check: Major Changes see list

dev-java/java-dep-check: Major Changes see list

1. Added initial Java docs, could use more inline comments on function
2. Switched to Lambda expressions and Streams were possible
3. Updated to use asm 5 from asm 3
4. Changed how initial package.env is loaded, via props vs parsing lines
5. Preffixed global class variables with m for member of class

TODO
1. Another block calling external java-config -p should use package.env
   Needs to support preffix, to load other packages package.env thus use
   of java-config -p for now.
2. May need to refactor how this package is laid out, file names, etc

Package-Manager: portage-2.3.0
Closes: https://github.com/gentoo/gentoo/pull/2323

Signed-off-by: James Le Cuirot <chewi@gentoo.org>