[cmake] CPMUtil rewrite of the day number 852 (#4130)

Composite PR for several changes to CPMUtil, most notably:
- https://git.crueter.xyz/CMake/CPMUtil/pulls/19
- https://git.crueter.xyz/CMake/CPMUtil/pulls/22
- https://git.crueter.xyz/CMake/CPMUtil/pulls/24
- https://git.crueter.xyz/CMake/CPMUtil/pulls/25

These contain a lot of changes that generally simplify control flow and improve ease-of-use. Read those descriptions and patchsets for more info.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4130
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

tools/cpm/cmake/package/dir.cmake

@@ -0,0 +1,33 @@
+#!/usr/bin/env -S cmake -P
+
+# SPDX-FileCopyrightText: Copyright 2026 crueter
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+cmake_minimum_required(VERSION 3.31)
+
+include(${CMAKE_CURRENT_LIST_DIR}/../ScriptUtils.cmake)
+
+function(usage)
+    echo([=[
+Usage: cpmutil.sh package dir [-a|--all] [PACKAGE]...
+
+Get the local directory for the specified packages.
+
+Options:
+    -a, --all       Operate on all packages in this project.
+]=])
+endfunction()
+
+parse_script_args(args)
+
+# TODO: CI packages.
+
+foreach(key ${args})
+    parse_key(${key})
+
+    # Guh.
+    get_cache_path(${package} ${version} cache_path)
+
+    cmake_path(ABSOLUTE_PATH cache_path NORMALIZE OUTPUT_VARIABLE abs_path)
+    echo("${key}: ${abs_path}")
+endforeach()