draw-importance: Rewrite CLI with batch mode
draw-importance: Rewrite CLI with batch mode

This commit refactors the draw-importance tool with multiple features like
+ Use click module for CLI parsing
+ Add --help for getting help
+ Add --verbose mode to get detailed output
+ Add --raw mode to get raw values
+ Add --path mode for batch processing of multiple files in a nice way
+ Uses regex pattern to match the files

The default mode where $program $hres.png $imps.bin is now replaced with the --input mode.

xiph/rav1e,xiph/rav1e