Namespace Editor Highlighting Xshd

Contains HighlightingLoader (reads xshd XML into an XshdSyntaxDefinition and compiles it into an IHighlightingDefinition), SaveXshdVisitor (serializes back to XML), and the AST node types (XshdRuleSet, XshdSpan, XshdRule, XshdKeywords, XshdColor, etc.).

Supports both xshd v1 and v2 formats via V1Loader and V2Loader.