Summary

Changes the format used by the RichTextArea (more specifically, its RichTextFormatHandler registered with the RichTextModel) to save/load/copy/paste rich text.

Problem

An issue was discovered where character attributes were improperly saved.

Solution

The solution involves changing the format. The impact is lessened by the fact that RichTextArea is still being incubated.

Specification

The new format is documented in https://github.com/andy-goryachev-oracle/Test/blob/main/doc/RichTextArea/RichTextArea_DataFormat_V2.md

(a copy will be attached to this CSR)