[cmake, docs, tools] update CPMUtil (#3183)

Rewrote the entire tooling scheme. That's about it, just make sure
tooling works as expected everywhere.

Signed-off-by: crueter <crueter@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3183
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

tools/cpm/package/util/fix-hash.sh

@@ -0,0 +1,30 @@
+#!/bin/sh -e
+
+# SPDX-FileCopyrightText: Copyright 2025 crueter
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+: "${PACKAGE:=$1}"
+
+# shellcheck disable=SC1091
+. "$SCRIPTS"/vars.sh
+
+[ "$CI" = null ] || exit 0
+
+[ "$HASH_URL" = null ] || exit 0
+[ "$HASH_SUFFIX" = null ] || exit 0
+
+[ "$HASH" = null ] && echo "-- * Package has no hash specified" && exit 0
+
+ACTUAL=$("$SCRIPTS"/util/url-hash.sh "$DOWNLOAD")
+
+if [ "$ACTUAL" != "$HASH" ] && [ "$QUIET" != true ]; then
+	echo "-- * Expected $HASH"
+	echo "-- * Got      $ACTUAL"
+	[ "$UPDATE" != "true" ] && exit 1
+fi
+
+if [ "$UPDATE" = "true" ] && [ "$ACTUAL" != "$HASH" ]; then
+	NEW_JSON=$(echo "$JSON" | jq ".hash = \"$ACTUAL\"")
+
+	"$SCRIPTS"/util/replace.sh "$PACKAGE" "$NEW_JSON"
+fi