Disable custom Git Hooks globally via configuration file (#2450)

* Create option to disable githooks globally via configuration file

* Update comment in app.ini to align with @ethantkoenig's suggestion

Signed-off-by: Matti Ranta <matti@mdranta.net>

modules/templates/helper.go

@@ -155,6 +155,9 @@ func NewFuncMap() []template.FuncMap {
 			}
 			return out.String()
 		},
+		"DisableGitHooks": func() bool {
+			return setting.DisableGitHooks
+		},
 	}}
 }