Provide a simple way to rename variables

[HadynM]

Often I will copy the contents of a screen into a new app which may use variables for some of the functionality.  The variables are valid but the context, and therefore the name, are different.  Currently, I go through each occurrence and manually rename it.  It would be great to click View > Variables, choose the variable, and rename it.  This screen already knows the definition, uses, and indirect uses.

[MrNappa]

Not only local variables, we also need this for global variables and collections.

[Boneckrh19]

I would love this ability! This could be accomplished with a "find and replace" option, but since all the variables are already listed on their own page, this seems easy to implement. A fantastic idea for collections as well