tplimpl: Add built-in print funcs to FuncMap

Add print, printf, and println to the Hugo FuncMap so that they are
accessible to the apply template func.

Updates #3139

tpl/tplimpl/template_funcs.go

@@ -2152,6 +2152,9 @@ func (t *templateFuncster) initFuncMap() {
 		"partialCached": t.partialCached,
 		"plainify":      plainify,
 		"pluralize":     pluralize,
+		"print":         fmt.Sprint,
+		"printf":        fmt.Sprintf,
+		"println":       fmt.Sprintln,
 		"querify":       querify,
 		"readDir":       t.readDirFromWorkingDir,
 		"readFile":      t.readFileFromWorkingDir,