Prompt dialog improvements

[christian-byrne]

• Use widget's type to set the type of dialog inputs. If it's a number, pass the min, max, and step options as well. From ComfyUI#1612

  Switching those inputs to type="number" and adding step="0.05" would show the arrows, and allow keyboard up/down arrows and mouse wheel to change the value in 0.05 increments/decrements. Also, min and max attributes can limit the values whenever needed. Having to manually type values while you could use the mouse wheel to change them is rather cumbersome.
  

• Close widget prompt dialogs by clicking canvas. From ComfyUI#90

• Allow closing with touch event. Currently if the dialog is rendered offscreen on touch device, there is no way to get rid of it other than refreshing

• ComfyUI#1023 is also fixed

[christian-byrne]

Separated into #80 for closing prompt dialog and #81 for number inputs.