Speed up netscanner

[zanderlewis]

This PR speeds up netscanner by removing tons of .clone() functions from various scripts. .clone() functions are replaced with references.

Note

My last PR was my first time contributing code to another project, so I wanted to see if I can do anything else for the project!

[Chleba]

Amazing work - Thanks a lot. I was planing that after some time spend with rust as part of some refactoring huge part of netscanner code.
Great that I have half of the job done :).

This PR may fix #11 by speeding up the process itself.

This is caused by concurrency problem that need to be refactored in discovery.rs code.

This PR speeds up netscanner

I think this will not speed up things that much, but it will not use that much memory - but I may need to be corrected on this one.

[Chleba]

Huge work has been done from Your side @zanderlewis. Thank You very much.

[Chleba]

My last PR was my first time contributing code to another project, so I wanted to see if I can do anything else for the project!

Just for next time - I would recommend to create a new branch in your fork for any other next PR's that You would like to make. When someone would like to try fix some conflict, it would be much better to see unique names on branches to better understand from where, what has been added and etc.

[Chleba]

I tested everything and beside that after scanning some subnet the arrow is not showed in the table it's looking really good. I'll solve that in another commit so don't worry about that.
Thank you very much for your help. I really appreciate that.