Overview of changes in 1.49.4, 27-11-2021
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* Require fontconfig 2.13
* Require harfbuzz 2.6
* Many fixes to line breaking accuracy
* coretext: Correctly clamp text weights at min/max values
* Add serialization api for PangoLayout, PangoFont and PangoAttrList
* Require json-glib
* tests: Use serialized layouts for test cases
* tests: Include fonts in git
* pango-view: Accept serialized layouts
* Fix a rounding problem with font metrics
* Fix visible space display using ␣