update argument names "pkg" to path

[mariev]

In addition to playing nicely with #34 implementation of config file vt_use_validation will need to be updated to handle case when validation folder lives outside of vignettes.

Two additional use cases to address:

1. author includes validation folder in something besides vignettes, but still within pkg. E.g. inst/ or vignettes/something/validation
2. author places validation folder outside package

[mariev]

@thebioengineer vt_use_validation_config also seems to expect a package as top level. How will this play with case 2 ☝️ ?

[thebioengineer]

The actual function should operate okay, it will create a .validation folder at the path identified, and add a .here as well.

[mariev]

so we just need to update argument names? It looks like the .validation config file is using "path".

[thebioengineer]

I think for most of the functions it would be updating the argument pkg to be path. I've tried to be consistent with functions that interface with the user so it should be a matter of just replacing. but lets do that once we have most of these PR's closed

[mariev]

@thebioengineer where do we stand on this?

[thebioengineer]

still to do