Support setting the step of numeric properties
A new attribute has been added to all numeric properties: step value. It determines the value of a single increment/decrement that numeric property widgets use when their associated properties are modified using sliders or spin boxes (users are still able to type any valid property value in text edits). Numerous processors and pipelines had to be updated to work with the changed NumericProperty interface. However, choosing a well-suited step value for each property can make it easier for users to modify the property — using one step value for all properties leads to cases where it is either too small, causing users to go through property values which don't cause any visible change, or too big, making it difficult to quickly determine the right property value.
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