[lworld] RFR: 8368333: [lworld] Add preview mode to ImageReader and JRT file-system [v10]

[David Beaumont]

> Java changes for supporting preview mode when preview mode resources (with new location flags) are available.
> 
> At the moment, this code will operate on non-preview jimage files (1.0) and act as if no preview resources are available by virtue of the default value for missing attributes and package flags being zero (which matches jimage 1.0).
> 
> This should be reviewed on top of https://github.com/openjdk/valhalla/pull/1618

David Beaumont has updated the pull request incrementally with two additional commits since the last revision:

 - remove ImageReaderFactory.java (again)
 - Reapplying feedback changes.

-------------

Changes:
  - all: https://git.openjdk.org/valhalla/pull/1619/files
  - new: https://git.openjdk.org/valhalla/pull/1619/files/5445f160..3253307a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1619&range=09
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1619&range=08-09

  Stats: 132 lines in 2 files changed: 0 ins; 106 del; 26 mod
  Patch: https://git.openjdk.org/valhalla/pull/1619.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1619/head:pull/1619

PR: https://git.openjdk.org/valhalla/pull/1619