Lataa Typst 0.3.0

Breaking changes:

- Renamed a few symbols: What was previous dot.op is now just dot and the basic dot is dot.basic. The same applies to ast and tilde.
- Renamed mod to rem to more accurately reflect the behaviour. It will remain available as mod until the next update as a grace period.
- A lone underscore is not a valid identifier anymore, it can now only be used in patterns
- Removed before and after arguments from query. This is now handled through flexible selectors combinator methods
- Added support for attachments (sub-, superscripts) that precede the base symbol. The top and bottom arguments have been renamed to t and b.

New features
- Added support for more complex strokes (configurable caps, joins, and dash patterns)
- Added cancel function for equations
- Added support for destructuring in argument lists and assignments
- Added alt text argument to image function
- Added toml function for loading data from a TOML file
- Added zip, sum, and product methods for arrays
- Added fact, perm, binom, gcd, lcm, atan2, quo, trunc, and fract calculation

Improvements
- Text in SVGs now displays properly
- Typst now generates a PDF heading outline
- References now provides the referenced element as a field in show rules
- Refined linebreak algorithm for better Chinese justification
- Locations are now a valid kind of selector
- Added a few symbols for algebra
- Added Spanish smart quote support
- Added selector function to turn a selector-like value into a selector on which combinator methods can be called
- Improved some error messages
- The outline and bibliography headings can now be styled with show-set rules
- Operations on numbers now produce an error instead of overflowing

Bug fixes
- Fixed wrong linebreak before punctuation that follows inline equations, citations, and other elements
- Fixed a bug with argument sinks
- Fixed strokes with thickness zero
- Fixed hiding and show rules in math
- Fixed alignment in matrices
- Fixed some alignment bugs in equations
- Fixed grid cell alignment
- Fixed alignment of list marker and enum markers in presence of global alignment settings
- Fixed path closing
- Fixed compiler crash with figure references
- A single trailing line breaks is now ignored in math, just like in text

Command line interface
- Font path and compilation root can now be set with the environment variables TYPST_FONT_PATHS and TYPST_ROOT
- The output of typst fonts now includes the embedded fonts

Development
- Added instrumentation for debugging and optimization
- Added --update flag and UPDATE_EXPECT environment variable to update reference images for tests
- You can now run a specific subset with --subtest
- Tests now run on multiple threads