readSX 0.8.3

• CRAN release version.
• Removed dependence on labelled-package.
• Added more tests: CSV in encodings utf16, ansi, and utf8, semicolon and comma-separated
• Fixed bugs where named character vector filepaths would not be processed.
• More checks and better error messages if files not found or strange formats.
• Refactored code into smaller internal functions.
• cli-based condition messages rather than rlang.
• Added test coverage and associated badges to readme