[bisq-network/bisq] Upgrade JavaFX to v15 (#4242)

[Christoph Atteneder]

I pushed some minor fixes. Besides that the app runs just fine.

I've recognized that the created dmg now has an ugly java icon on top

**Before**
![Bildschirmfoto 2020-12-22 um 11 54 31](https://user-images.githubusercontent.com/170962/102881270-e54a7f00-444c-11eb-8675-9998974464f4.png)

**After**
![Bildschirmfoto 2020-12-22 um 11 53 20](https://user-images.githubusercontent.com/170962/102881285-ec718d00-444c-11eb-892d-b254e1afe3f2.png)

Would be great to get rid of this again.

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