Change expressions with 'file' type to 'binary' type

[lion7]

In the Swagger 2.0 specification you could specify a file upload using the 'special' parameter type file.
This type does not exist in the OpenAPI 3.0 specification, instead the binary format should be used.

Currently (almost) all mustache/handlebars templates check a file using the expression {{#is this 'file'}}
An solution is to change this to {{#is this 'binary'}}. This does imply that all relevant templates have to be changed. I will create another pull request where this is not necessary but that requires a change to the intepretation of type's.

@HugoMario could you review both PR's and pick the most preferred solution?

[HugoMario]

thanks for your PR's i'll take a time this friday or earlyy next week to review them a merge them

[HugoMario]

@lion7 this makes sense, however some generators still works with file type, besides is not present on OAS3, i´ll work with your PR in order to use an option that allow us to work with both data type accordinng users selection. thanks!

[mfvitale]

Hi,
in which release is this fix present?