Adds control of line endings (newline separators) in `StyledTextModel`, `RichTextArea`, and `CodeArea`.
The impacted areas are: - saving to plain text - copying to plain text This feature is implemented as a regular field in the `StyledTextModel` (since it is ultimately an attribute of the model), and as a property in the `CodeArea`. ------------- Commit messages: - tests - line endings Changes: https://git.openjdk.org/jfx/pull/1944/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1944&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8370140 Stats: 263 lines in 13 files changed: 234 ins; 9 del; 20 mod Patch: https://git.openjdk.org/jfx/pull/1944.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1944/head:pull/1944 PR: https://git.openjdk.org/jfx/pull/1944
