Jonas Jenwald d9f9fa4f1c Move the zoomIn/zoomOut functionality into BaseViewer (PR 14038 follow-up)
Given the simplicity of this functionality, we can move it from the default viewer and into the `BaseViewer` class instead. This way, it's possible to support more scripting functionality in the standalone viewer components; please see PR 14038.

Please note that I purposely went with `increaseScale`/`decreaseScale`-method names, rather than using "zoom", to better match the existing `currentScale`/`currentScaleValue` getters/setters that's being used in the `BaseViewer` class.
2021-09-19 11:54:57 +02:00
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