Fix the verbose partial #559

[gergan]

Addresses #559

Summary of changes:
We have the same problem as the reporter of #559 but using the handelbars implementation. I think the root of all problems is that almost everywhere the partial name currently is compared with subdir concatenated with '/' and filename.

subdir contains the OS native representation of the relative path, so it will work on linux but not on windows as it will contain backslashes and the rest will be generated with slashes.
I have found the property verbosePartial, which strangely enough is not used anywhere, but has the same value as the things against which pattern_assembler and pattern_registry are testing the partials.

So my solution was to 'normalize' the verbose partial with only forward slashes and use it consequently throughout the sources.

I will create a pull request for the Handelbars implementation (patternengine-node-handlebars), which than makes it work with the default include syntax.

The assumption for the two patches is that the templates are using only forward slashes for the inclusion, which is the only reasonable assumption in my opinion.

[bmuenzenmeyer]

hello @gergan

thanks for diving into this issue and looking into a fix - I will admit the verbose include syntax is not something I use often.

I am going to point this PR at dev per the contributions guidelines

[gergan]

hello @bmuenzenmeyer

my bad have overlooked the contribution guidelines

[bmuenzenmeyer]

💯This looks great - demonstrates a willingness to dive into the code and improve it.