Port additional voting mechanisms from snapshot.org #13

[victaphu]

Fixes # https://github.com/harmony-one/snapshot/issues/13

Changes proposed in this pull request:

• added new voting types (Single, Approval, Ranked, Weighted, Quadratic)
• fixed linting issues
• upgraded Vue to 3.2.1
• migrated voting logic for voting types into the repo

[givp]

@jhd2best I'm reviewing this PR. Could you please review also? Thanks.