Splits up into:
- escaping: resolving of escape sequences
- parser: the parsing code
- tests: all integrated parsing tests
Also moves Ident from the root syntax module into the tree module.
- In addition to syntax trees there are now `Value`s, which syntax trees can be evaluated into (e.g. the tree is `5+5` and the value is `10`)
- Parsing is completely pure, function calls are not parsed into nodes, but into simple call expressions, which are resolved later
- Functions aren't dynamic nodes anymore, but simply functions which receive their arguments as a table and the layouting context
- Functions may return any `Value`
- Layouting is powered by functions which return the new `Commands` value, which informs the layouting engine what to do
- When a function returns a non-`Commands` value, the layouter simply dumps the value into the document in monospace
- Problems -> Diagnostics
- Position -> Pos
- offset_spans -> Offset trait
- Size -> Length (and some more size types renamed)
- Paper into its own module
- scope::Parser -> parsing::CallParser
- Create `Decorations` alias
- Remove lots of double newlines
- Switch from f32 to f64
- Forced line breaks with backslash followed by whitespace
- (Multline) raw text in backticks
- Set font class fallbacks with [font.family] (e.g. [font.family: monospace=("CMU Typewriter Text")])
- More sophisticated procedure to find end of function, which accounts for comments, strings, raw text and nested functions (this is a mix of a feature and a bug fix)
- Dynamic models instead of SyntaxTrees
- No more ParseResult/LayoutResult
- Errors and Decorations which are propagated to parent contexts
- Models are finally clonable
