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

[poire-z]

Includes from koreader/crengine#252 & koreader/crengine#251 :

• EPUB: workaround ZIP files with corrupted central directories. Closes #4464
• Supports book text encoded in WTF-8
• Harfbuzz kerning (full): fix possible wrong flags
• (Upstream) Adds new kerning method: Harfbuzz light, without ligatures

Includes koreader/koreader-base#794

• Adds missing support in ffi/util.lua utf8charcode() for 4-bytes UTF-8 chars (text selection from book would be truncated to the first 4-bytes char met).

Adds Harfbuzz light kerning methods as the 3rd toggle.
(Not yet set as a new default instead of Freetype, let's use that new one for a while to be sure it's really good and deserves to be the default.)

Also:

• ConfigDialog: tweak widths computation
  Small fixes to widths computation for a more balanced layout.
  Decreased min width of names (on the left) from 33% to 25%, to allow more room for toggles on the right.
  (May make things a little bit too stretched out with english, but should help with other languages that use longer words to name things than english.)
  Also ignore disabled option names in the names width calculation (noticable on the PDF right most config menu, where toggles were uneededly too small)
  I had to reduce the width of my emulator in the following screenshots, to not show super wide sausages... Looks better on my GloHD... If there's a need for tuning that, we can raise the 25% in default_name_align_right = math.max(default_name_align_right, 0.25) and change the padding on the left/middle/right default_option_hpadding = Size.padding.fullscreen

• InfoMessage: avoid overflowing screen height with long messages
  When no height= provided, and the InfoMessage would overflow screen heigh when some long message is provided, decrease the font size until the widget fit.

(screenshot of my emulator with its height resized down)

[Frenzie]

lgtm

[Frenzie]

lgtm