Includes additional twig syntax featires (#1367)

"from," "import" and "use" are both twig built-in, and uses the same techniques as include, embed etc when resolving template names.

Some twig templates use  {%- ... -%} syntax that gobble up the whitespace on each side. This change ensures that this syntax is understood when looking for partials.

Co-authored-by: Josef Bredreck <13408112+JosefBredereck@users.noreply.github.com>

Author: mogsie

packages/engine-twig/lib/engine_twig.js

@@ -124,7 +124,7 @@ var engine_twig = {
   engineFileExtension: '.twig',
 
   // regexes, stored here so they're only compiled once
-  findPartialsRE: /{%\s*(?:extends|include|embed)\s+('[^']+'|"[^"]+").*?%}/g,
+  findPartialsRE: /{%[-]?\s*(?:extends|include|embed|from|import|use)\s+('[^']+'|"[^"]+").*?%}/g,
   findPartialKeyRE: /"((?:\\.|[^"\\])*)"/,
   findListItemsRE:
     /({{#( )?)(list(I|i)tems.)(one|two|three|four|five|six|seven|eight|nine|ten|eleven|twelve|thirteen|fourteen|fifteen|sixteen|seventeen|eighteen|nineteen|twenty)( )?}}/g, // TODO