Added namespaces to includes like in Python. (0.14.0)

examples/include_namespace.fun

@@ -0,0 +1,57 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the ISC license.
+ * https://opensource.org/license/isc-license-txt
+ *
+ * Added: 2025-09-30
+ */
+
+// Demonstration of the include-as namespace feature.
+//
+// Run examples (without installing) by pointing FUN_LIB_DIR to the repo lib:
+//   Linux/macOS/FreeBSD:
+//     FUN_LIB_DIR="$(pwd)/lib" ./build/fun examples/include_namespace.fun
+//   Windows (CMD):
+//     set FUN_LIB_DIR=%CD%\lib && build-debug\fun.exe examples\include_namespace.fun
+//   Windows (PowerShell):
+//     $env:FUN_LIB_DIR="$PWD\lib"; .\build\fun.exe examples\include_namespace.fun
+
+// Import stdlib math helpers into alias 'm'
+#include <utils/math.fun> as m
+
+// Import a local module (this repository file) into alias 'mod'
+#include "examples/namespaced_mod.fun" as mod
+
+print("=== include-as namespace demo ===")
+
+print("Using m.add and m.times from <utils/math.fun>:")
+print("m.add(2, 3)   = " + to_string(m.add(2, 3)))
+print("m.times(4, 5) = " + to_string(m.times(4, 5)))
+
+print("")
+print("Using mod.hello and mod.Greeter from namespaced_mod.fun:")
+print(mod.hello("Fun"))
+
+g = mod.Greeter("Hi")
+g.say("World")
+
+print("")
+print("=== done ===")
+
+/* Expected output:
+=== include-as namespace demo ===
+Using m.add and m.times from <utils/math.fun>:
+m.add(2, 3)   = 5
+m.times(4, 5) = 20
+
+Using mod.hello and mod.Greeter from namespaced_mod.fun:
+Hello, Fun!
+Hi World
+
+=== done ===
+*/

examples/namespaced_mod.fun

@@ -0,0 +1,25 @@
+#!/usr/bin/env fun
+// The shebang line makes no sense here because this is a library which will 
+// never be executed, but it shows that it is not wrong. 
+
+/*
+* This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the ISC license.
+ * https://opensource.org/license/isc-license-txt
+ *
+ * Added: 2025-09-30
+ */
+
+// namespaced_mod.fun
+// Simple module to demonstrate include-as namespaces with functions and classes.
+
+fun hello(name)
+  return "Hello, " + to_string(name) + "!"
+
+class Greeter(string prefix)
+  // Methods must declare 'this' as the first parameter
+  fun say(this, name)
+    print(this.prefix + " " + to_string(name))