XFA - Fix font scale factors (bug 1720888)

- All the scale factors in for the substitution font were wrong because of different glyph positions between Liberation and the other ones:
    - regenerate all the factors
  - Text may have polish chars for example and in this case the glyph widths were wrong:
    - treat substitution font as a composite one
    - add a map glyphIndex to unicode for Liberation in order to generate width array for cid font

src/core/xfa/xfa_object.js

@@ -73,6 +73,8 @@ const $onChild = Symbol();
 const $onChildCheck = Symbol();
 const $onText = Symbol();
 const $pushGlyphs = Symbol();
+const $popPara = Symbol();
+const $pushPara = Symbol();
 const $removeChild = Symbol();
 const $root = Symbol("root");
 const $resolvePrototypes = Symbol();
@@ -177,6 +179,16 @@ class XFAObject {
     return false;
   }
 
+  [$popPara]() {
+    if (this.para) {
+      this[$getTemplateRoot]()[$extra].paraStack.pop();
+    }
+  }
+
+  [$pushPara]() {
+    this[$getTemplateRoot]()[$extra].paraStack.push(this.para);
+  }
+
   [$setId](ids) {
     if (this.id && this[$namespaceId] === NamespaceIds.template.id) {
       ids.set(this.id, this);
@@ -1109,7 +1121,9 @@ export {
   $onChild,
   $onChildCheck,
   $onText,
+  $popPara,
   $pushGlyphs,
+  $pushPara,
   $removeChild,
   $resolvePrototypes,
   $root,