merge upstream changes v3.0

upgrade to ucx 3.0

rewrite Makefile to work with different getopt implementations

add test for empty file

update tests

removes build/ucx from makefile

ucx is now used as external library

removes span around line number

test header file now contains user-select:none property

Release of version 2.0

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

words (token) are now stored as sstr_t

refactors highlighter_t and removes abstraction overhead

changes signature of parser functions to use a UcxBuffer - the functions itself don't use the API yet

cleans up formatfile function up to the parser call

cleans up main function

replaces custom copyfile() function with ucx_stream_copy calls

increases input buffer + adds regression tests

fixes plaintext output

adds UCX + changes how the input file is read (uses an consecutive memory area now)

use macros for exit codes

adds version number and changes build system

fixed possible naming conflicts with is.* functions

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