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

src/bytecode.c

@@ -1,3 +1,13 @@
+/**
+ * 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
+ */
+
+
 #include "bytecode.h"
 #include <stdlib.h>
 #include <string.h>
@@ -127,4 +137,3 @@ void bytecode_dump(const Bytecode *bc) {
         printf("  %3d: %-15s %d\n", i, opcode_name(ins->op), ins->operand);
     }
 }
-