[bisq-network/bisq] Backup, restore and create a new onion address via GUI (#3044)

[Florian Reimair]

This PR adds features that allow the user to 
- backup her current onion address,
- restore a previously onion address backup
- and even create a completely new onion address

all from within the GUI.

**How do you make sure that there are no more open offers or even ongoing trades before you import/renew the address?**
I don't. I have reworked the P2P backend so that a single client can have multiple hidden services up and running at any time. If the user renews/imports an onion address, a new hidden service is started. Hidden services are only removed once no more open offers or ongoing trades are there (checked for after every completed trade/closed offer).

**All during runtime?**
No. A restart is required for the import and renew features.

Contains DE translations as well.

Here are some impressions:
![Screenshot from 2019-08-01 13-28-50](https://user-images.githubusercontent.com/1070734/62289942-56f0ea00-b460-11e9-86b7-8bd5dc91324e.png)
![Screenshot from 2019-08-01 13-29-57](https://user-images.githubusercontent.com/1070734/62289997-81db3e00-b460-11e9-83b7-f5ed12f731a6.png)
![Screenshot from 2019-07-30 12-09-40](https://user-images.githubusercontent.com/1070734/62289802-f792da00-b45f-11e9-954f-19752da0742d.png)


closes #1055, closes #1056, subsequently closes #909 and does take care of a lot of preparation work for #2873.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/3044

-- Commit Summary --

  * Gui mockup
  * Refactored starting Tor
  * Removed double assignment of nodeAddressProperty
  * Remove unnecessary field
  * Migrate to new folder structure of HSs
  * Only report HSready when all HS are started
  * Report TorNode ready once we now our address
  * Formatting cosmetics
  * Renew address is active
  * Added clearHS stub
  * First-time launch of Bisq works again
  * Report unused HS on trade/offer close
  * Report HS in use instead of unused ones
  * Clear unused hidden services
  * Reenable rolling backup
  * Add informative popup before renew
  * HS backup active
  * HS restore active
  * DE translations
  * Handle duplicate hidden service situation

-- File Changes --

    M core/src/main/java/bisq/core/offer/OpenOfferManager.java (20)
    M core/src/main/java/bisq/core/trade/TradeManager.java (9)
    M core/src/main/resources/i18n/displayStrings.properties (9)
    M core/src/main/resources/i18n/displayStrings_de.properties (9)
    M core/src/test/java/bisq/core/offer/OpenOfferManagerTest.java (6)
    M desktop/src/main/java/bisq/desktop/main/settings/network/NetworkSettingsView.fxml (13)
    M desktop/src/main/java/bisq/desktop/main/settings/network/NetworkSettingsView.java (53)
    M monitor/src/main/java/bisq/monitor/AvailableTor.java (4)
    M p2p/src/main/java/bisq/network/p2p/P2PService.java (37)
    M p2p/src/main/java/bisq/network/p2p/network/LocalhostNetworkNode.java (22)
    M p2p/src/main/java/bisq/network/p2p/network/NetworkNode.java (15)
    M p2p/src/main/java/bisq/network/p2p/network/NewTor.java (4)
    M p2p/src/main/java/bisq/network/p2p/network/RunningTor.java (4)
    M p2p/src/main/java/bisq/network/p2p/network/TorMode.java (4)
    M p2p/src/main/java/bisq/network/p2p/network/TorNetworkNode.java (325)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/3044.patch
https://github.com/bisq-network/bisq/pull/3044.diff

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