Small imporvements

Made progressMap independent of description, so multiple descriptions can be the same
Added AtomicInteger instead, so indices are distinct
Added descriptionMap for descriptions
Added current index to each Progress object to identify it in progressMap
Made description and list publicly available
Added SafeVarargs annotation to varargs methods
Inlined updateProgress method to directly access progressMap
Used Thread.ofVirtual() so execution is suspended while printer thread sleeps
Moved startTime inside the printer thread, so it only starts after the Progress object is actually created, not when Progress.reset() is called
Removed description if size < 0
Added 0 to seconds if seconds are only single digit and minutes are present
Updated Demo
Updated README