[code-reflection] Integrated: Updated UIs for heal and violajones to use seven seg display widget

[Gary Frost]

For some consistency (prep for J1 demos) I am trying to use some common layouts for example UI's

Here we us use the seven seg widget (included in life example)  for violajones and heal examples.

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Commit messages:
 - Updated UIs for heal and violajones to use seven seg display widget

Changes: https://git.openjdk.org/babylon/pull/343/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=343&range=00
  Stats: 59 lines in 6 files changed: 31 ins; 4 del; 24 mod
  Patch: https://git.openjdk.org/babylon/pull/343.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/343/head:pull/343

PR: https://git.openjdk.org/babylon/pull/343