[bisq-network/bisq] Sign single account (#4957)

[sqrrm]

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This a proposed solution to https://github.com/bisq-network/growth/issues/212

The user to get signed copies the account data and sends it over whichever channel, keybase for example. With this change the arbitrator can sign this account.

Step 1, user copies account data (ctrl+c to copy AccountAgeWitness and PubKey to clipboard)
![image](https://user-images.githubusercontent.com/23560607/102233437-8dfa5b00-3ef0-11eb-8959-e9ee05c4ec13.png)

Step 2, arbitrator imports data (under accounts view, open signing tab with ctrl+i, in signing tab, open specific account signing window with ctrl+p)
![image](https://user-images.githubusercontent.com/23560607/102233347-791dc780-3ef0-11eb-8a56-da22103961a2.png)

Step 3, arbitrator signs with their private key (this could be helpful for devs that want to test signed accounts as well)
![image](https://user-images.githubusercontent.com/23560607/102233610-bf732680-3ef0-11eb-93f7-ae7fe67ab6c1.png)

Step 4, done
![image](https://user-images.githubusercontent.com/23560607/102233674-cf8b0600-3ef0-11eb-80a2-a3cd23cd15a7.png)

I know this is very pretty, but please don't ask me to implement all the UI stuff due to this flash feature.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4957

-- Commit Summary --

  * Copy account data to clipboard
  * Sign imported AccountAgeWitness,PubKey

-- File Changes --

    M core/src/main/java/bisq/core/account/witness/AccountAgeWitnessService.java (27)
    M core/src/main/resources/i18n/displayStrings.properties (5)
    M desktop/src/main/java/bisq/desktop/main/account/content/PaymentAccountsView.java (5)
    M desktop/src/main/java/bisq/desktop/main/account/content/fiataccounts/FiatAccountsView.java (10)
    M desktop/src/main/java/bisq/desktop/main/overlays/windows/SignSpecificWitnessWindow.java (120)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4957.patch
https://github.com/bisq-network/bisq/pull/4957.diff

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