RFR: JDK-8266779: Use <wbr> instead of ZERO_WIDTH_SPACE [v2]

[Hannes Wallnöfer]

> This replaces usages of the zero-width space character (ZWSP, entity `​`) with the HTML5 `<wbr>` element. `<wbr>` acts as a word break opportunity without adding characters to the text content like ZWSP does. It is supported in all modern browsers, the only browser I  know of which doesn't support is are old versions of Internet Explorer. 
> 
> https://developer.mozilla.org/en-US/docs/Web/HTML/Element/wbr
> https://caniuse.com/wbr-element
> 
> I have tested the output (both layout and copy-paste behaviour) on Firefox, Safari, and Chrome on Mac OS X.

Hannes Wallnöfer has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into JDK-8266779
 - JDK-8266779: Use <wbr> instead of ZERO_WIDTH_SPACE

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3946/files
  - new: https://git.openjdk.java.net/jdk/pull/3946/files/095f16d2..a5508d09

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3946&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3946&range=00-01

  Stats: 191 lines in 6 files changed: 86 ins; 91 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3946.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3946/head:pull/3946

PR: https://git.openjdk.java.net/jdk/pull/3946