Mitigate against memo abuse (e.g. scam messages)

[314159265359879]

If you see something like this in your wallet, ignore it. the website is phishing for your keys.

Some options to deal with this in the wallet:

1. Show a partial memo
2. filter out urls
3. filter out common scam messages
4. flag anything that is not a random string of characters (commonly used for memo's on exchanges) or yes/no/agree/disagree (commonly used for voting)
5. Do not show memo until we have a better solution.

Or perhaps

6. Leave it as is and expect users to use common sense.

[markmhendrickson]

either 2 or 5 sound fine to me

[314159265359879]

I am in favour of 5, it is in line with the web extension and it also prevents a phisher to work around 2.

[kyranjamie]

5*: don't show memos on inbound transactions

[markmhendrickson]

@friedger is this something you could tackle this week or prefer someone else does? 🙏

[markmhendrickson]

Assigning myself to QA