filter: Added --files-from-raw flag

--files-from parses input files by ignoring comments starting with # and ;
and stripping whitespace from start and end of strings.

The --files-from-raw flag was added that reads every line from the file ignoring
comment characters and not stripping whitespace while maintaining
backwards compatibility.

Fixes #3762

docs/content/docs.md

@@ -1542,6 +1542,7 @@ For the filtering options
   * `--include`
   * `--include-from`
   * `--files-from`
+  * `--files-from-raw`
   * `--min-size`
   * `--max-size`
   * `--min-age`