Gpencil: Improve Opacity Modifier- object:

i propose to have opacity factor get influenced by an object position and a raduis value to controle the range where we will have "X"( from 1->0) and decrease to 0 value . so object to to define the center of the effect.

note that the fill will also get infuenced by that ,for usage case is where we want to make sth appear gradually by keyframing raduis 'range' espacially when we build text which has fill and we desire make inside'fill' the text appear by opacity instead of building them. and let only strokes get builded "the outliner of a character get builded before the fill get appeared"

hope for that others modifiers support object raduis option for dynamic animations like thickness, noise