[bisq-network/bisq] Bisq using up too much memory on Linux even after closing (#3918)

[Stan]

I think this is due to one or several JavaFx bugs related to https://bugs.openjdk.java.net/browse/JDK-8188094

During profiling, I noticed that the JavaFX Application Thread had been allocated 66.6 GiB
![JavaFX-App-Thread-Alloc-66Gib-2020-02-19 17-45-46](https://user-images.githubusercontent.com/36207203/74886556-397d6200-5357-11ea-94b2-be600a94b996.png)
This couldn't be right, as my vm is 8 GiB, and my bisq instance had -Xmx=4g.  Thinking it was just a jDK Mission Control bug, I've been reproducing the problem with a tiny javafx demo app that constantly leaks from the JavaFx app thread (the same demo app found in the OpenJDK bug report).
I have not found a solution.  I'm running Ubuntu 18 & 19(vm), using an nvidia gpu.

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