Added --update and --nsescriptdb commands to sicat.py

[madaragon]

This commit introduces two new commands, --update and --nsescriptdb, to sicat.py. These commands enable the updating and registration of the nse_script.db database.

Usage: python sicat.py --update --nsescriptdb

[justakazh]

Sorry too late, I will review this at Sunday

Thanks.

[justakazh]

Sorry for waiting so long to review, please check out some of the comments I've made.

thanks

[madaragon]

updated branch. please review:)