Change a Create Variable function to an Update Variable function and viceversa
Many times, we think that Create Variable is the adecuate function for our usecase but in the end we needed an Update Variable function and we now have to re do all the structure of the variable when all that is needed is to change the function type (since the structure is the same). A 'change function' that allows to change functions to similar function types without re doing the structure of the variable would be very useful. Bubble io does it ('replace by another type'), you can use it as an example. 
