Adds Word Expansion: use of letter spacing for justification

Bump crengine:
- Text: fix occasional BiDi bad word splitting
- Font: fix HB fallback measurement/drawing mismatches
- Font: do not add letter spacing on diacritics
- Text: tunable use of letter spacing for justification
- Text: dont adjust space after initial quotation mark/dash (rework)
- Text: fix possible bad widths after collapsed spaces

xtext.cpp: pick crengine fix with HB fallback
measurement/drawing mismatches

Adds "Word Expansion" to bottom Font size menu, and moved
"Word Spacing" there too, to balance the panels' heights
to 4 items.

frontend/ui/data/strings.lua

@@ -17,6 +17,7 @@ S.COLUMNS = _("Columns")
 -- @translators Text alignment. Options given as icons: left, right, center, justify.
 S.TEXT_ALIGN = _("Alignment")
 S.FONTSIZE_FINE_TUNING = _("Fine Tuning")
+S.FONT_SIZE = _("Font Size")
 S.CONTRAST = _("Contrast")
 -- @translators Reflow text.
 S.REFLOW = _("Reflow")
@@ -34,6 +35,7 @@ S.GAMMA = _("Gamma")
 S.FONT_HINT = _("Font Hinting")
 S.FONT_KERNING = _("Font Kerning")
 S.WORD_SPACING = _("Word Spacing")
+S.WORD_EXPANSION = _("Word Expansion")
 S.VIEW_MODE = _("View Mode")
 S.EMBEDDED_STYLE = _("Embedded Style")
 S.EMBEDDED_FONTS = _("Embedded Fonts")
@@ -57,6 +59,8 @@ S.NONE = _("none")
 S.SMALL = _("small")
 S.MEDIUM = _("medium")
 S.LARGE = _("large")
+S.SOME = _("some")
+S.MORE = _("more")
 S.DECREASE = _("decrease")
 S.INCREASE = _("increase")
 S.LIGHTEST = _("lightest")