Rename imageflow cli tool to something more convenient/shorter

[eugenesvk]

←imageflow_tool is a rather long and inconvenient name to type for a cli tool Would you please at least remove the _tool part →imageflow or maybe even come up with an even more abbreviated name, e.g., image is commonly abbreviated to img, so that would make the name →imgflow

[lilith]

(lib)imageflow is distributed on lots of platforms and languages, and overloading 'imageflow' doesn't work. So it can't be imageflow.exe or ./imageflow - it would need to be something else.

That said, maybe imfl? Try alias imfl=imageflow_tool if you're on bash