FilterSelector Controller

Used metadata:

- `directedFilterAttributes`: List of attribute names which should have rules already ready when using the filter tools. For WMS layers.

Used functionalities:

- `preset_layer_filter`: Name of the layer (data source) that should be toggled in the filter tool upon loading an application. Note: although this is a list, only one can be defined.
- `filterable_layers`: A list of layer names that can be filtered, if empty the component will be hidden.

### Hierarchy

- FilterSelectorController

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