Improve module-info parsing (ignore comments)

This plugin contains a simplified version of the parser in https://github.com/gradlex-org/java-module-dependencies.
There have been some fixes there wrt. ignoring comments. These should be ported here as well.

E.g. comment like this is interpreted as _module name_ declaration (`SOMETHING` will be used as name):

```
module real.name {              // (1) SOMETHING
```