Dashboard "Messages" tab displays transfer memos

**Is your feature request related to a problem? Please describe.**

There is no user friendly messaging system in the UI.

**Describe the solution you'd like**

Add a "Messages" tab next to the "Activity" tab in the "Dashboard":

User clicks on "Messages" and gets a new screen with all incoming and outgoing transactions that contain a `memo` field. The UX of the tab is uncluttered by transaction detail and tailored towards an IRC-style text chat environment, with unlabeled columns:

`TIME - FROM/TO - MEMO
`
The timestamp of each message would be local time, ISO8601 format, and hyperlink to a popup of the transaction detail raw JSON.

The `FROM/TO` column is either color coded by incoming/outgoing or labeled line by line as

`FROM `
`TO `
etc...

Bottom of the page includes chat room style UX transfer UI with with entry fields:

`MEMO - TO - AMOUNT - ASSET
`
By default the amount is set to 0.00001 BTS

**Additional considerations**

- Allow for the `TO` field to accept both `account_name` or `account_id` formats.

- Allow for bulk messages by permitting `TO` field to be a single user *or* a comma separated list of users, such that each party receives `AMOUNT`. List should allow for mix of `account_name` and `account_id` formats.

- Pressing send should include a popup window for confirmation

**Describe alternatives you've considered**
Stand alone messaging app.

**Additional context**


https://en.wikipedia.org/wiki/Internet_Relay_Chat

https://duckduckgo.com/?q=IRC+chat&iax=images&ia=images

No files, tests, or entry points are named. Start by locating the Dashboard and Activity tab implementation, then trace how transaction memos and transfers are handled; done means a Messages tab supports the specified memo display, recipient formats, bulk recipients, transfer fields, confirmation, and transaction-detail links.

Written by the indexing model from the issue text.