[bisq-network/bisq] Improve spinner performance (#2135)

[Christoph Atteneder]

The default spinner implemented by the JavaFX framework causes high CPU load. We want to use/implement an improved version that causes less unnecessary load.

![Bildschirmfoto 2018-12-18 um 10.34.48.png](https://images.zenhubusercontent.com/5a0bffe08a75884b90877eda/2e243a91-8c34-4aa5-acee-5f98b291d3c8)

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