RFR: Added JBS Label Dictionary

[Jesper Wilhelmsson]

Moving the JBS label Dictionary from the OpenJDK wiki into the Guide. Did some updates of the text.

I'm guessing this dictionary is missing several labels used by libraries and client since it has a hotspot background.
Please let me know what labels to add (or just add them).

I also moved the noreg-* description from "Change Planning" into this dictionary as I think it fits better here. All
labels have anchors so you can link directly to any label in the dictionary.

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Commit messages:
 - Added JBS Label Dictionary

Changes: https://git.openjdk.java.net/guide/pull/26/files
 Webrev: https://webrevs.openjdk.java.net/?repo=guide&pr=26&range=00
  Stats: 616 lines in 3 files changed: 493 ins; 95 del; 28 mod
  Patch: https://git.openjdk.java.net/guide/pull/26.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/26/head:pull/26

PR: https://git.openjdk.java.net/guide/pull/26