RFR: 8290471: jpackage: allow to specify codepage on Windows [v2]

[Alex Kasko]

> It is proposed to introduce support for `--win-codepage` argument, and substitute the `Codepage` attribute with `--win-codepage` specified value in primary l10n file when it is being copied to the config dir.
> 
> Instead of copying all internal l10n files, it is proposed to copy only the primary file. Plain copy is used if `--win-codepage` is not specified. Otherwise `--win-codepage` value is substituted in l10n file using DOM and XPath.
> 
> See more details in issue description and in links added there.
> 
> Testing:
> 
>  - [x] ran `jtreg:jdk/tools/jpackage`
>  - [x] test for `--win-codepage` argument is included with the patch

Alex Kasko has updated the pull request incrementally with two additional commits since the last revision:

 - extend the test to cover utf-8 codepage
 - new argument description in --help output

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9546/files
  - new: https://git.openjdk.org/jdk/pull/9546/files/aefec1ce..0e4241ce

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9546&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9546&range=00-01

  Stats: 58 lines in 5 files changed: 44 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/9546.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9546/head:pull/9546

PR: https://git.openjdk.org/jdk/pull/9546