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This pull request adds support for languages that require complex text layout.
We are using a standalone library 'Raqm', that wraps FriBidi (for bidirectional
text support) and HarfBuzz (for text shaping), and does proper BiDi and script
itemization.
We also add a -font-features option to allow controlling font features used
during text layout.
Raqm support is enabled by default but can be disabled at compiling time.
This is the follow up to #69,
but uses Raqm as a standalone library and supports setting font features.