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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

--- a/tpl/tplimpl/template_funcs.go

+++ b/tpl/tplimpl/template_funcs.go

@@ -2152,6 +2152,9 @@

 		"partialCached": t.partialCached,

 		"plainify":      plainify,

 		"pluralize":     pluralize,

+		"print":         fmt.Sprint,

+		"printf":        fmt.Sprintf,

+		"println":       fmt.Sprintln,

 		"querify":       querify,

 		"readDir":       t.readDirFromWorkingDir,

 		"readFile":      t.readFileFromWorkingDir,

--- a/tpl/tplimpl/template_funcs_test.go

+++ b/tpl/tplimpl/template_funcs_test.go

@@ -148,6 +148,9 @@

 mod: {{mod 15 3}}

 modBool: {{modBool 15 3}}

 mul: {{mul 2 3}}

+print: {{ print "works!" }}

+printf: {{ printf "%s!" "works" }}

+println: {{ println "works!" -}}

 plainify: {{ plainify  "Hello <strong>world</strong>, gophers!" }}

 pluralize: {{ "cat" | pluralize }}

 querify 1: {{ (querify "foo" 1 "bar" 2 "baz" "with spaces" "qux" "this&that=those") | safeHTML }}

@@ -221,6 +224,9 @@

 mod: 0

 modBool: true

 mul: 6

+print: works!

+printf: works!

+println: works!

 plainify: Hello world, gophers!

 pluralize: cats

 querify 1: bar=2&baz=with+spaces&foo=1&qux=this%26that%3Dthose

-- 

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