Merge topic 'improve-diagnostic'

ca072e3734 cmListFileLexer: Test for broken UTF-32-(BE|LE) BOM
3b8ddf3f45 cmListFileLexer: Handle null character in the grammar
7040406f86 cmListFileLexer: Do not require null-terminated input
0a26c08004 cm/string_view: Prevent find access past string end
63328f01f8 Utilities/Scripts: Drop CommandArgument lexer/parser generation step

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !11173