Uses inexistent getter and setter callbacks

[indigoxela]

For example here:

https://github.com/backdrop-contrib/profile/blob/1.x-1.x/profile.info.inc#L26

But actually in the whole file, it seems.

Function entity_property_getter_method() was part of the D7 entity module, but isn't part of anything in B - neither core nor entity_plus.

For this specific getter callback, there's an equivalent in entity_plus named entity_plus_property_getter_method with the same params.

Other candidates:

• entity_plus_property_verbatim_set (instead of entity_property_verbatim_set)

There may be more to fix, but this (missing) function is a problem in one of my migration projects, which prevents indexing with search_api.

[indigoxela]

@bugfolder here's a PR: #38

With that change, search_api indexing works for me.