RFR: JDK-8285932 Implementation of JEP 430 String Templates (Preview) [v69]

[Jim Laskey]

> Enhance the Java programming language with string templates, which are similar to string literals but contain embedded expressions. A string template is interpreted at run time by replacing each expression with the result of evaluating that expression, possibly after further validation and transformation. This is a [preview language feature and API](http://openjdk.java.net/jeps/12).

Jim Laskey has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 88 commits:

 - Merge branch 'master' into 8285932
 - Dangling <p>
 - Recommended changes
 - Requested changes
 - CSR recommendations
 - Merge branch 'master' into 8285932
 - Spacing
 - Tidy up
 - Remove @PeviewFeature(feature=PreviewFeature.Feature.STRING_TEMPLATES) from non-public classes
 - Typo
 - ... and 78 more: https://git.openjdk.org/jdk/compare/44fa12e7...f4f26611

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Changes: https://git.openjdk.org/jdk/pull/10889/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10889&range=68
  Stats: 9330 lines in 73 files changed: 9233 ins; 23 del; 74 mod
  Patch: https://git.openjdk.org/jdk/pull/10889.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/10889/head:pull/10889

PR: https://git.openjdk.org/jdk/pull/10889