oak-less 0.0.11

Less stylesheet language parser with support for web styling and layout processing.
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# Less AST Module

This module defines the Abstract Syntax Tree (AST) structure for Less code.

## AST Nodes

- **LessRoot**: The root node of the Less AST, containing a list of top-level nodes.
- **LessNode**: A variant representing different types of Less nodes (rule sets, at-rules, comments).
- **RuleSet**: A Less rule set consisting of selectors and declarations.
- **Declaration**: A Less declaration consisting of a property name and value.
- **Selector**: A variant representing different types of Less selectors.
- **Value**: A variant representing different types of Less values.
- **AtRule**: A variant representing different types of Less at-rules.

## Usage

```rust
use oak_less::{LessRoot, LessNode, RuleSet, Declaration, Selector, Value};

// Create a simple Less AST
let ast = LessRoot {
    nodes: vec![
        LessNode::RuleSet(RuleSet {
            selectors: vec![Selector::Element("div".to_string())],
            declarations: vec![Declaration {
                property: "color".to_string(),
                value: Value::Keyword("red".to_string()),
                span: 0..15,
            }],
            span: 0..15,
        }),
    ],
};
```

## Features

- **Serde Support**: AST nodes can be serialized and deserialized when the `serde` feature is enabled.
- **Source Location**: All AST nodes include span information for source location tracking.
- **Comprehensive Structure**: Covers all major Less constructs including selectors, rules, declarations, and values.