improve updateble values

...ej-client/src/main/java/cz/it4i/fiji/haas/ui/FXFrame.java

...in/java/cz/it4i/fiji/haas/ui/ObservableValueRegistry.java

...n/java/cz/it4i/fiji/haas/ui/UpdatableObservableValue.java

...main/java/cz/it4i/fiji/haas_spim_benchmark/core/Task.java

...z/it4i/fiji/haas_spim_benchmark/core/TaskComputation.java

.../fiji/haas_spim_benchmark/ui/BenchmarkSPIMController.java

...i/fiji/haas_spim_benchmark/ui/ObservableTaskRegistry.java

...fiji/haas_spim_benchmark/ui/SPIMPipelineProgressView.fxml

...spim_benchmark/ui/SPIMPipelineProgressViewController.java

...aas_spim_benchmark/ui/SPIMPipelineProgressViewWindow.java

.../src/test/java/cz/it4i/fiji/haas/RunSPIMPipelineView.java