Add an option to constrain the X and Y axis values of each transformation

Adding an option to constrain (link) the X and Y axis values of each transformation would be beneficial to reduce some hassles. For example, if you want to enter exactly the same scaling value in X and Y, you currently have to enter it in each of the X and Y fields. It is tedious and also it might be the cause of accidental displacement of values.

This idea was proposed here:
[http://esotericsoftware.com/forum/Questions-Requests-according-to-entering-values-of-2-axis-16817](http://esotericsoftware.com/forum/Questions-Requests-according-to-entering-values-of-2-axis-16817)