Allow overriding only one template

[Nihisil]

Right now if you specify --templates option it makes the tool load all templates from the provided folder.

And if there are missing files in this folder it raises an error.

I think it would be helpful to add fallback here and if in the provided folder template is not exists to load it from the default template folder.

[js2me]

Hello @Nihisil , thanks for this issue!
Yes, it is a good idea to customize only one template

[js2me]

5.1.7 Release has partial fix for this issue (Allow to remove all unused templates except templates used in ETA includeFile())

[js2me]

It will fixed in 6.0.0 major version