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tpl: Use hash for cache key

Use a hash for the cache key, to fix 'file name too long' errors when retreiving from long urls

Fixes #3690

--- a/tpl/data/cache.go

+++ b/tpl/data/cache.go

@@ -14,8 +14,9 @@

 package data

 import (

+	"crypto/md5"

+	"encoding/hex"

 	"errors"

-	"net/url"

 	"sync"

 	"github.com/gohugoio/hugo/config"

@@ -27,7 +28,8 @@

 // getCacheFileID returns the cache ID for a string.

 func getCacheFileID(cfg config.Provider, id string) string {

-	return cfg.GetString("cacheDir") + url.QueryEscape(id)

+	hash := md5.Sum([]byte(id))

+	return cfg.GetString("cacheDir") + hex.EncodeToString(hash[:])

 }

 // getCache returns the content for an ID from the file cache or an error.