true: execute callback on each change, false: execute callback when slider movement is finished
Optional throttleMS: numberMakes sure that the callback function is not executed multiple times within this time,
                  only takes effect if onSliding is true.
                  - 0: no throttling
                  - > 0: throttling with the defined time in milliseconds
                  - undefined: use default throttling time from slider control
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Function for assigning a callback to slider value changes.
It can be configured whether the callback should be executed on each change or just when the final slider position is reached.
Furthermore a throttling time can be configured, so that the amount of callback executions will be limited.