Add support for trailling comma for method paramerts

[astronom]

Since the last update trailing comma supports for constructor property promotion. Also support for arrays. But there is no support for method and function parameters.

See https://github.com/nette/php-generator/blob/master/src/PhpGenerator/Printer.php#L322 Var special is determined dynamically

Suggest to add some parameter to Printer and support trailing comma whether needed.

[dg]

Oh, that's a bug in the code, it was supposed to print trailing comma every time.

[astronom]

I instal the version with fix and it is working!
But in dev-master now is trailing whitespace in comment...
When are youg going to release?

[dg]

I tried to fix it, can you test it?

[astronom]

I suppose this will fix trailing whitespace in multiline comments #107