RFR: 8274148: can jshell show deprecated classes, methods and fields as strikethrough text? [v2]

[Jan Lahoda]

> This adds a limited highlighting for JShell. It underlines keywords, highlights declarations and shows deprecated elements inversed (on platforms other than Linux) or with a strikethrough (on Linux).
> 
> For example, non-Linux platforms:
> ![jshell-coloring-other](https://user-images.githubusercontent.com/51319204/149968951-df00b3a0-0463-4a9a-9d48-49925030409e.png)
> 
> Linux:
> ![jshell-coloring-linux](https://user-images.githubusercontent.com/51319204/149968969-93c75731-de41-4ac5-b5c0-a1ac2a32ddd8.png)

Jan Lahoda 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 three additional commits since the last revision:

 - Cleanup.
 - Merge branch 'master' into JDK-8274148
 - 8274148: can jshell show deprecated classes, methods and fields as strikethrough text?

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7130/files
  - new: https://git.openjdk.java.net/jdk/pull/7130/files/dd557311..8114073e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7130&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7130&range=00-01

  Stats: 33756 lines in 1221 files changed: 22263 ins; 6448 del; 5045 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7130.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7130/head:pull/7130

PR: https://git.openjdk.java.net/jdk/pull/7130