Add real-time value display feature to plugin-image-slider-response

[raynatang]

Added real-time value display feature to plugin-image-slider-response: if the parameter value_display is set as true, the slider's value will be displayed in real-time below the slider as participants adjust it.

Before participants adjust the slider, the displayed value will be the slider_start value

[changeset-bot[bot]]

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Latest commit: fcd8dd771cfeeb73847aecd40e2a63a7cfe649c9

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