RFR: Cleanup for v1

[Andrew Haley]

This is the Big Diff that removes scope locals, Lifetimes, etc. I've left the virtual machine support in for now. I'm
also going to create a separate branch with the simple virtual ThreadLocal support + Lifetimes, and we'll see what that
looks like.

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Commit messages:
 - Remove Lifetimes and scope variables
 - Remove Lifetimes and scope variables

Changes: https://git.openjdk.java.net/loom/pull/18/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=18&range=00
  Stats: 1378 lines in 12 files changed: 0 ins; 1376 del; 2 mod
  Patch: https://git.openjdk.java.net/loom/pull/18.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/18/head:pull/18

PR: https://git.openjdk.java.net/loom/pull/18