MapStructByTag takes a struct and target tag name present on fields in that struct, then converts it into a map[string]interface{}.

MarshalMapToURLValues creates a url.Values from a map[string]string.

MarshalToTerraform takes a source struct (`src`), a destination Terraform *ResourceData (`dest`), and a Terraform schema map[string]*Schema and then marshals the source data into the destination data given a `terraform` tag present on the fields in the source struct.

SimpleHashcode calculates a simple integer hashcode by iterating over all the fields/keys in a map, concating the values in buffer, then calculating the hashcode of that buffer.

TerraformIDFieldName is a special field name that can be used to identify the value that should be storedin/retrieved from the ID field in Terraform.