Shader: Add support for for-each statements and improve arrays

src/Nazara/Shader/ShaderLangLexer.cpp

@@ -47,7 +47,9 @@ namespace Nz::ShaderLang
 			{ "external",     TokenType::External },
 			{ "false",        TokenType::BoolFalse },
 			{ "fn",           TokenType::FunctionDeclaration },
+			{ "for",          TokenType::For },
 			{ "if",           TokenType::If },
+			{ "in",           TokenType::In },
 			{ "let",          TokenType::Let },
 			{ "option",       TokenType::Option },
 			{ "return",       TokenType::Return },