[tools] refactor, use #!/bin/sh, update license files (#3998)

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3998
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

tools/lanczos-gen.pl

@@ -1,5 +1,5 @@
-#!/usr/bin/perl
-# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+#!/usr/bin/env perl
+# SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 # SPDX-License-Identifier: GPL-3.0-or-later
 use strict;
 use warnings;