feat: Add flag to read from file/stdin (#405)

* from standard

* improve

* happy clippy

* explicit arg option

* fix problem

completions/_dust

@@ -43,6 +43,7 @@ _dust() {
 '--atime=[just like -mtime, but based on file access time]: : ' \
 '-y+[just like -mtime, but based on file change time]: : ' \
 '--ctime=[just like -mtime, but based on file change time]: : ' \
+'--files0-from=[run dust on NUL-terminated file names specified in file; if argument is -, then read names from standard input]: :_files' \
 '-p[Subdirectories will not have their path shortened]' \
 '--full-paths[Subdirectories will not have their path shortened]' \
 '-L[dereference sym links - Treat sym links as directories and go into them]' \