Add Haxe language support via vshaxe/haxe-language-server

Includes full setup with ls provider, tests, docs, etc.

test/resources/repos/haxe/test_repo/.gitignore

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+export/
+dump/
+bin/

test/resources/repos/haxe/test_repo/build.hxml

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+-cp src
+-main Main
+--no-output

test/resources/repos/haxe/test_repo/src/Main.hx

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+import utils.Helper;
+
+/**
+ * Main class for testing Haxe language server functionality.
+ *
+ * This class tests:
+ * - Symbol discovery (class, methods, fields)
+ * - Within-file references
+ * - Cross-file references to utils.Helper
+ */
+class Main {
+	var message:String;
+	var count:Int;
+
+	public function new() {
+		message = greet("World");
+		count = Helper.addNumbers(5, 10);
+	}
+
+	/**
+	 * Greet someone by name.
+	 */
+	public function greet(name:String):String {
+		return "Hello, " + name + "!";
+	}
+
+	/**
+	 * Calculate and return the formatted result.
+	 */
+	public function calculateResult():String {
+		var sum = Helper.addNumbers(count, 20);
+		var formatted = Helper.formatMessage(message);
+		return formatted + " (sum: " + Std.string(sum) + ")";
+	}
+
+	public static function main() {
+		var app = new Main();
+		Sys.println(app.calculateResult());
+	}
+}

test/resources/repos/haxe/test_repo/src/utils/Helper.hx

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+package utils;
+
+/**
+ * Utility functions for the Haxe test application.
+ *
+ * This class provides helper functions used by the Main class.
+ */
+class Helper {
+	/**
+	 * Format a message by adding brackets around it.
+	 */
+	public static function formatMessage(msg:String):String {
+		return "[ " + msg + " ]";
+	}
+
+	/**
+	 * Add two numbers together.
+	 */
+	public static function addNumbers(x:Int, y:Int):Int {
+		return x + y;
+	}
+
+	/**
+	 * Multiply two numbers.
+	 */
+	public static function multiplyNumbers(x:Int, y:Int):Int {
+		return x * y;
+	}
+}