Backdrop_Adjust

This is a tool I've been planning for a while to create mostly because I am just 

really unhappy with the default Bakdrop tool. Few reasons are:

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- when you create one without having anything selected it is too small

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- it is difficult to resize, even now that you have 4 corners in Nuke v13

- the left aligned text often not practical

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- the random colors are ofen too colorful and distracting in the scripts

I am aware that I am not the first who customizes the Backdrop and certainly there are some great ones out there so it is merely my take on the task as I wanted to learn a few things that was required to add certain functions. Feel free to take and customize further!