Rename prefix/suffix needs to be opt-in

[amcasey]

I believe this is the main change: 0a97663

I believe the goal was to be able to rename x to y like this:

const x = 1;
export { x };

const y = 1;
export { y as x };

Since editors pre-dating this change don't know that prefix and suffix text might accompany the rename result, they don't apply it, resulting in

const y = 1;
export { y };

which breaks any importing file.

We probably need a UserPreference to make this behavior opt-in.

[minestarks]

@DanielRosenwasser @sandersn this changed in 3.2 and looks rather bad in VS - can we target fixing it sooner?