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Add a test to confirm that OPENAPPEND honors the BOM in the file.

Add test coverage for writing a binary file.
This is mostly a test that the high-byte of a character is ignored.

Test when READCHARs processes a Unicode file.

Remove some trailing whitespace.

Refactor to use WRITEBINARYDATA during test setup, where applicable.
This makes the test logic easier to read.

Add a test that SETREAD retains the encoding/mode of when the file was opened.

Add test coverage for CRLF -> LF conversion when reading files without a BOM.

Add test coverage for reading UTF-8 files with variations on EOL sequences

Add test converage for more variations on UTF-8 encodings

Refactoring: Centralize the definition of the UTF8_BOM.