[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/vars.sh

@@ -0,0 +1,170 @@
+#!/bin/sh -e
+
+# SPDX-FileCopyrightText: Copyright 2025 crueter
+# SPDX-License-Identifier: LGPL-3.0-or-later
+
+# shellcheck disable=SC1091
+
+value() {
+	echo "$JSON" | jq -r ".$1"
+}
+
+[ -z "$PACKAGE" ] && echo "Package was not specified" && exit 0
+
+# shellcheck disable=SC2153
+JSON=$(echo "$PACKAGES" | jq -r ".\"$PACKAGE\" | select( . != null )")
+
+[ -z "$JSON" ] && echo "!! No cpmfile definition for $PACKAGE" >&2 && exit 1
+
+# unset stuff
+export PACKAGE_NAME="null"
+export REPO="null"
+export CI="null"
+export GIT_HOST="null"
+export EXT="null"
+export NAME="null"
+export DISABLED="null"
+export TAG="null"
+export ARTIFACT="null"
+export SHA="null"
+export VERSION="null"
+export GIT_VERSION="null"
+export DOWNLOAD="null"
+export URL="null"
+export KEY="null"
+export HASH="null"
+export ORIGINAL_TAG="null"
+export HAS_REPLACE="null"
+export VERSION_REPLACE="null"
+export HASH_URL="null"
+export HASH_SUFFIX="null"
+export HASH_ALGO="null"
+
+########
+# Meta #
+########
+
+REPO=$(value "repo")
+CI=$(value "ci")
+
+PACKAGE_NAME=$(value "package")
+[ "$PACKAGE_NAME" = null ] && PACKAGE_NAME="$PACKAGE"
+
+GIT_HOST=$(value "git_host")
+[ "$GIT_HOST" = null ] && GIT_HOST=github.com
+
+export PACKAGE_NAME
+export REPO
+export CI
+export GIT_HOST
+
+######################
+# CI Package Parsing #
+######################
+
+VERSION=$(value "version")
+
+if [ "$CI" = "true" ]; then
+	EXT=$(value "extension")
+	[ "$EXT" = null ] && EXT="tar.zst"
+
+	NAME=$(value "name")
+	DISABLED=$(echo "$JSON" | jq -j '.disabled_platforms')
+
+	[ "$NAME" = null ] && NAME="$PACKAGE_NAME"
+
+	export EXT
+	export NAME
+	export DISABLED
+	export VERSION
+
+	return 0
+fi
+
+##############
+# Versioning #
+##############
+
+TAG=$(value "tag")
+ARTIFACT=$(value "artifact")
+SHA=$(value "sha")
+GIT_VERSION=$(value "git_version")
+
+[ "$GIT_VERSION" = null ] && GIT_VERSION="$VERSION"
+
+if [ "$GIT_VERSION" != null ]; then
+	VERSION_REPLACE="$GIT_VERSION"
+else
+	VERSION_REPLACE="$VERSION"
+fi
+
+echo "$TAG" | grep -e "%VERSION%" >/dev/null &&
+	HAS_REPLACE=true || HAS_REPLACE=false
+
+ORIGINAL_TAG="$TAG"
+
+TAG=$(echo "$TAG" | sed "s/%VERSION%/$VERSION_REPLACE/g")
+ARTIFACT=$(echo "$ARTIFACT" | sed "s/%VERSION%/$VERSION_REPLACE/g")
+ARTIFACT=$(echo "$ARTIFACT" | sed "s/%TAG%/$TAG/g")
+
+export TAG
+export ARTIFACT
+export SHA
+export VERSION
+export GIT_VERSION
+export ORIGINAL_TAG
+export HAS_REPLACE
+export VERSION_REPLACE
+
+###############
+# URL Parsing #
+###############
+
+URL=$(value "url")
+BRANCH=$(value "branch")
+
+export BRANCH
+export URL
+
+. "$SCRIPTS"/vars/url.sh
+
+export DOWNLOAD
+
+###############
+# Key Parsing #
+###############
+
+KEY=$(value "key")
+
+. "$SCRIPTS"/vars/key.sh
+
+export KEY
+
+################
+# Hash Parsing #
+################
+
+HASH_ALGO=$(value "hash_algo")
+[ "$HASH_ALGO" = null ] && HASH_ALGO=sha512
+
+HASH=$(value "hash")
+
+if [ "$HASH" = null ]; then
+	HASH_SUFFIX="${HASH_ALGO}sum"
+	HASH_URL=$(value "hash_url")
+
+	if [ "$HASH_URL" = null ]; then
+		HASH_URL="${DOWNLOAD}.${HASH_SUFFIX}"
+	fi
+
+	HASH=$(curl "$HASH_URL" -Ss -L -o -)
+else
+	HASH_URL=null
+	HASH_SUFFIX=null
+fi
+
+export HASH_URL
+export HASH_SUFFIX
+export HASH
+export HASH_ALGO
+export JSON