[code-reflection] Integrated: Added simple map transformer to OpTk + Config convenience methods

[Gary Frost]

Trying to minimize op.transform ceremony. 

Added a strawman simple mapping transformer to OpTk. 

Also added some convenience methods to Config.

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Commit messages:
 - Added simple map transformer to OpTk + Config convenience methods

Changes: https://git.openjdk.org/babylon/pull/620/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=620&range=00
  Stats: 339 lines in 16 files changed: 288 ins; 10 del; 41 mod
  Patch: https://git.openjdk.org/babylon/pull/620.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/620/head:pull/620

PR: https://git.openjdk.org/babylon/pull/620