Review Request: keywords and operators parser on Java and Scala

## Keywords and Operators Parser
Take Java for example, we define `java-keywords` and `java-operators` in 
`java-lang.scm`.

The `keyword_parser` in `java_language.cpp` will load `java-keywords` 
when initialized, it will parse keywords and calculate the corresponding 
keyword group for proper color.

The `keyword_parser` and `operator_parser` allow us to define keywords 
and operators in scheme, this is the killer feature.

## Ref
https://savannah.gnu.org/patch/?9884



-------- Forwarded Message --------
Subject: 	[patch #9884] Parser: keywords and operators parser on Java 
and Scala
Date: 	Sat, 18 Jan 2020 09:11:00 -0500 (EST)
From: 	Darcy Shen <[email protected]>
To: 	Joris van der Hoeven <[email protected]>, Darcy Shen 
<[email protected]>, [email protected], [email protected], 
[email protected]



URL:
<https://savannah.gnu.org/patch/?9884>

Summary: Parser: keywords and operators parser on Java and
Scala Project: GNU TeXmacs
Submitted by: sadhen
Submitted on: Sat 18 Jan 2020 10:10:59 PM CST
Category: Editor
Action: None
Privacy: Public
Assigned to: vdhoeven
Originator Email: Open/Closed: Open
Release: Discussion Lock: Any
Fixed Release: Stable:
_______________________________________________________

Details:

see https://github.com/texmacs/texmacs/pull/35

Use the following command to download the diff to /tmp/diff.


wget https://github.com/texmacs/texmacs/pull/35.diff -O /tmp/diff





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