Leading whitespace before Class keyword prevents import

Saving a `cls` file with leading space before the class keyword will not import on save or via "Import and Compile" menu option.

Example `src/Leading/Space.cls`:

```
 Class Leading.Space
{
}
```

The extension should either report an error that the file didn't import or not prevent import/compile since `$SYSTEM.OBJ.Load` will import and compile the file without issue.
