Add option for password authentication with island

[itaymmguardicore]

Feature / Fixes

Add option to authenticate with island using password

• Have you added an explanation of what your changes do and why you'd like to include them?
• Have you successfully tested your changes locally?

Changes

• Add option to authenticate with island using password
• Replace PyCrypto with Cryptodome (Fixes Pycrypto is dead, need to replace #234 )

[danielguardicore]

Looks good to me, except we should probably note somewhere that since we only hash our password with SHA3 and not something like scrpyt/bcrypt, that we're not saying you can't brute force our page.

Either way, LGTM. It can go in. Can you add a quick Wiki page on how to set up an Island with password protection?