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
func ResolveFile(file string) (string, error)
func ResolveFiles(files string) (map[string]string, error)
Resolve a string into a string using the following rules:
* If not exists return an error