CMakeLists.txt Refactoring

Hey jetbrains!

Thoroughly enjoying CLion, here. Thank you!

Any chance you could help me refactor my `CMakeLists.txt`s? I set a good number of variables with

```

set(MY_VAR, …)

set(CMAKE_BUILTIN_VAR, …).

```

I love being able to right-click→Refactor→Rename variables within jetbrains IDEs and it seems like these should be parse-able + rename-able within a `CMakeLists.txt`. But no refactoring is enabled for these variables.

Is this a doable thing?

Thank you for your help!