Liblet

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- Tree.with_threads now shows labels for jumps different from next.

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- Added the line number as attribute of the ANTLR annotated parse tree.
- Now TopDownInstantaneousDescription.predict does not put the ε on the stack.

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- Added save and load to ANTLR and AnnotatedTreeWalker documentation.
- Now also table use "Fira Code" (and the font name is in liblet.const).

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- Forgot to refactor tests.

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- GVWrapper now uses "Fira Code" as default font.
- Improved InstantaneousDescription representations
- Fixed a bug in Tree graph representation.

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- Added resized_svg_repr to liblet.display.
- Added svglib dependency (needed by resized_svg_repr).
- Improved GVWrapper in liblet.display.
- Added compose in liblet.utils.