Add a 'Swap Library variables with local variables' option
I'm currently using a library with a set of variables that we copy to a new project file. This works like a charm with Automate Sketch, but I'm missing an option to replace all references inside `symbols` with the local `layer styles`, `colors` and `font styles` that I'm using.

### Screenshots
1. A symbol from the library, with a reference to a layer style in that library
<img width="800" alt="Screenshot 2022-05-05 at 23 46 31" src="https://user-images.githubusercontent.com/31687098/167030906-5dd05212-363d-44ce-ad6d-1256ec0db866.png">

2. Selecting the local style by navigating the menu
<img width="763" alt="Screenshot 2022-05-05 at 23 48 05" src="https://user-images.githubusercontent.com/31687098/167031110-6a0d2328-cdfe-4b43-b934-84dbb474c874.png">

### Proposal
A function that replaces all references to `layer styles`, `colors` and `font styles` in a library with an eponymous variable in the local variable.
This should apply to `layer styles`, `font styles` and `symbols`.