Added tons of opcode documentation, changed license to ISC and a lot of file refactoring.

src/vm/core/halt.c

@@ -1,2 +1,30 @@
+/**
+ * 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
+ */
+
+/**
+* @file halt.c
+ * @brief Implements the OP_HALT opcode for stopping VM execution.
+ *
+ * This file handles the OP_HALT instruction, which stops the execution of the VM.
+ * No stack operations are performed.
+ *
+ * Behavior:
+ * - Stops the VM execution immediately.
+ *
+ * Example:
+ * // Bytecode: OP_HALT
+ * // Stack before: [42]
+ * // Stack after: [42]
+ *
+ * @author Johannes Findeisen
+ * @date 2025-10-16
+ */
+
 case OP_HALT:
     return;