bump crengine: Harfbuzz light, WTF-8, corrupted ZIPs

Includes:
- EPUB: workaround ZIP files with corrupted central directories
- Supports book text encoded in WTF-8
- Harfbuzz kerning (full): fix possible wrong flags
- (Upstream) Adds new kerning method: Harfbuzz light, without ligatures

Adds Harfbuzz light kerning methods as the 3rd toggle.

base

@@ -1 +1 @@
-Subproject commit 95da0edbba4ba03663d09d782d83d6edf5e95c19
+Subproject commit e151ca4891a02044fdfdc2b95f9175b4ba6bd3ac

frontend/ui/data/creoptions.lua

@@ -182,17 +182,18 @@ Note that your selected font size is not affected by this setting.]]),
             {
                 name = "font_kerning",
                 name_text = S.FONT_KERNING,
-                toggle = {S.OFF, S.FAST, S.ENHANCED},
+                toggle = {S.OFF, S.FAST, S.GOOD, S.BEST},
-                values = {0, 1, 2},
+                values = {0, 1, 2, 3},
                 default_value = 1,
-                args = {0, 1, 2},
+                args = {0, 1, 2, 3},
                 event = "SetFontKerning",
                 name_text_hold_callback = optionsutil.showValues,
                 help_text = _([[Font kerning is the process of adjusting the spacing between individual letter forms, to achieve a visually pleasing result.
 
 - off: no kerning.
 - fast: use FreeType's kerning implementation (no ligatures).
-- enhanced: use HarfBuzz's kerning implementation (slower, but may support ligatures with some fonts).
+- good: use HarfBuzz's light kerning implementation (faster than full but no ligatures and limited support for non-western scripts)
+- best: use HarfBuzz's full kerning implementation (slower, but may support ligatures with some fonts).
 
 (Font Hinting may need to be adjusted for the best result with either kerning implementation.)]]),
             },

frontend/ui/data/strings.lua

@@ -50,6 +50,8 @@ S.DEFAULT = _("default")
 S.DARKER = _("darker")
 S.NATIVE = _("native")
 S.FAST = _("fast")
+S.GOOD = _("good")
+S.BEST = _("best")
 S.ENHANCED = _("enhanced")
 S.LOW = _("low")
 S.HIGH = _("high")