text.ResolveFile

Resolve a string into a string using the following rules:
* If it is a valid Path and exists, return the contents of file(s)
      *  If not exists return an error
* If a valid go-getter URL, go-get it
* Else return the contents of the string
```golang
func ResolveFile(file string) (string, error) 
func ResolveFiles(files string) (map[string]string, error)
```