autofixes for common problems, not just for unused vars

Just thought that an autofix for something like this would be awesome:

```
std.debug.print("this is a number: {d}\n", 13)

->

std.debug.print("this is a number: {d}\n", .{13});
```

I have the python `print()` statement in muscle memory and I find it nearly impossible to retrain myself to write the correct Zig syntax for `std.debug.print`.  OTOH, an editor might fix it easily.