TAP5-2613: Upgrade tapestry build to Java 11

[dmitrygusev]

Initial implementation of the Java 11 build support.

All tests passed locally on:

java version "11.0.4" 2019-07-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.4+10-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.4+10-LTS, mixed mode)

[coderkun]

Does this PR relate to TAP5-2588 in any way?

[dmitrygusev]

@coderkun yes, in some sense, but it goes further to support Java 11 in the build. Java 9 is end of life.

Here's the initial discussion for this work: http://mail-archives.apache.org/mod_mbox/tapestry-dev/201906.mbox/%3cCA+v6cT-XmNWYvtqHvWQv5oV+1ustV7-=DedRb-7Y2x9Ym3xfkg@mail.gmail.com%3e

[thiagohp]

Thanks! Pull request applied manually.