Custom file extensions

[xificurk]

Hi, I really like this plugin, but I needed support for templates with other extensions than php, just like in standard File Templates. So here is PR for such a functionality.

There are many instances when this might come in handy, in my case I wanted to define a test case template for nette/tester that by convention uses phpt extension.

What this PR does:

• You can define File Template with extension class.*.
• When you select a template in PHP Class From Template dialog, the selected file extension is automatically changed based on the extension of the selected File Template, e.g. class.php -> php, class.phpt -> phpt.
• The change of file extension in PHP Class From Template dialog does not interfere with standard PHP Class dialog.

[aurimasniekis]

Thank you for your pull request, before I could merge could you merge your commits into single one?

[xificurk]

done

[xificurk]

@aurimasniekis ping