RFR: 8208377: Soft hyphens render if not using TextLayout

[Daniel Gredler]

Soft hyphens should never render, regardless of the rendering path used internally.

This PR does not expand the categorization of "complex" characters in `FontUtilities` in order to force the use of `TextLayout` rendering code paths (as was discussed in JBS).

Instead, it takes the existing (limited) format-category checks in `sun.font.CMap` (a TrueType font helper class), expands it to a more general / complete default-ignorable check (`FontUtilities.isDefaultIgnorable(int)`), and then moves these checks out of `CMap` and up a level into the `CharToGlyphMapper` classes themselves.

The Type1 and TTF glyph mappers have been updated, but the macOS glyph mapper has not been updated.

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Commit messages:
 - Always use invisible glyphs for 'default ignorable' chars

Changes: https://git.openjdk.org/jdk/pull/22670/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22670&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8208377
  Stats: 348 lines in 5 files changed: 325 ins; 15 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/22670.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22670/head:pull/22670

PR: https://git.openjdk.org/jdk/pull/22670