[code-reflection] Integrated: Hat fix min buffer state machine

[Gary Frost]

Swapped out the bitfield based states for buffer management to one using a state machine. 

Seems to be working.

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Commit messages:
 - State machine to avoid buffer transfers seems to be working
 - Added state to buffer bits
 - Should copy can access config directly
 - Moved shouldCopy (to/from) into Buffer
 - We have added the real length (minus the status bits) to the status bits.

Changes: https://git.openjdk.org/babylon/pull/362/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=362&range=00
  Stats: 962 lines in 20 files changed: 584 ins; 296 del; 82 mod
  Patch: https://git.openjdk.org/babylon/pull/362.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/362/head:pull/362

PR: https://git.openjdk.org/babylon/pull/362