Implement Bank system

[themaxhero]

Implement bank channel and related requests and events

Progress:

• [x] Implement bank channel
• [x] Create BankAccount Request
• [x] Transfer Request
• [x] Change password Request
• [x] Convert token into password Request
• [x] Close BankAccount Request
• [x] BankAccount bootstrap Request
• [x] Logout from BankAccount Request
• [x] BankAccountUpdated Event
• [x] BankAccountRemoved Event
• [x] HackedBankAccountAcquired Event
• [x] HackedBankAccountUpdated Event
• [x] HackedBankAccountRemoved Event
• [x] BankTransferSuccessful Event
• [x] BankTransferFailed Event
• [x] BankAccountLoggedIn Event
• [x] BankAccountLoggedOut Event

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This change is 

[sourcelevel-bot[bot]]

Hello, @themaxhero! This is your first Pull Request that will be reviewed by Ebert, an automatic Code Review service. It will leave comments on this diff with potential issues and style violations found in the code as you push new commits. You can also see all the issues found on this Pull Request on its review page. Please check our documentation for more information.

[sourcelevel-bot[bot]]

Ebert has finished reviewing this Pull Request and has found:

• 11 possible new issues (including those that may have been commented here).
• 3 fixed issues! 🎉

But beware that this branch is 31 commits behind the HackerExperience:master branch, and a review of an up to date branch would produce more accurate results.

You can see more details about this review at https://ebertapp.io/github/HackerExperience/Helix/pulls/399.