[bisq-network/bisq] [WIP] Don't allow trade start if BitcoinJ is not fully synced (#4764)

[James Cox]

Adds a check that chain height is within 3 blocks of the reported height from bitcoin peers -> if not the user is prevented from taking or creating an offer.  It shows a message informing the user that Bisq is not currently synced, advising them to wait for one Bitcoin block.

Additionally under Settings/Network a field has been added to show the chain height of Bisq vs the Peer group.  It can be
observed that Bisq chain height (from BitcoinJ) stays at 0 on startup until one new block has been published.

Fixes: #4727 
Fixes: #4707

### Screenshots

![Screenshot from 2020-11-07 22-59-29](https://user-images.githubusercontent.com/47253594/98457742-13e7f100-2150-11eb-9c12-b48aa9cbdfd8.png)

Network info showing chain height:
![Screenshot from 2020-11-07 22-39-37](https://user-images.githubusercontent.com/47253594/98457746-2bbf7500-2150-11eb-8a80-7a910709f112.png)

Logged upon attempting to take or create offer when not synced:
![image](https://user-images.githubusercontent.com/47253594/98457800-67f2d580-2150-11eb-870f-d22c795a43c6.png)

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4764

-- Commit Summary --

  * Don't allow trade start if BitcoinJ is not fully synced

-- File Changes --

    M core/src/main/java/bisq/core/btc/setup/WalletsSetup.java (9)
    M core/src/main/resources/i18n/displayStrings.properties (4)
    M desktop/src/main/java/bisq/desktop/main/offer/offerbook/OfferBookViewModel.java (6)
    M desktop/src/main/java/bisq/desktop/main/settings/network/NetworkSettingsView.fxml (5)
    M desktop/src/main/java/bisq/desktop/main/settings/network/NetworkSettingsView.java (8)
    M desktop/src/main/java/bisq/desktop/util/GUIUtil.java (5)
    M desktop/src/test/java/bisq/desktop/main/offer/offerbook/OfferBookViewModelTest.java (22)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4764.patch
https://github.com/bisq-network/bisq/pull/4764.diff

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