improves API and adds functions for strings Version 2.0

fixes ancient header macro

adds appropriate public API

highlighter can now handle files which do not end with a blank line

adds appendfile() function to main module + adds TODOs for source files which do not terminate with a blank line

merges all highlighter functions into one highlighter module

replaces stack buffers with UCX buffers

minor fixes and macro removals

cleans up includes

highlighter now use the UcxBuffer API for writing to the destination buffer

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