[tools, cmake] refactor: update/hash check scripts, use tags for some more deps, proper CPMUtil separation (#2666)

Uses tags for a bunch of deps that can use them

Also adds a bunmch of scripts to tools/cpm, notably for checking hashes
and checking for updates.

TODO for the future:
- CI target to check hashes
- Weekly CI to check for updates

Need to get that other CI runner up

additional stuff

- Ports gentoo fixes
- makes solaris work (TODO: sdl2)
- way better docs
- properly separates CPMUtil as a standalone project

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2666
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

tools/cpm/replace.sh

@@ -0,0 +1,20 @@
+#!/bin/sh -e
+
+# SPDX-FileCopyrightText: 2025 crueter
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# Replace a specified package with a modified json.
+
+# env vars:
+# - PACKAGE: The package key to act on
+# - NEW_JSON: The new json to use
+
+[ -z "$PACKAGE" ] && echo "You must provide the PACKAGE environment variable." && return 1
+[ -z "$NEW_JSON" ] && echo "You must provide the NEW_JSON environment variable." && return 1
+
+FILE=$(tools/cpm/which.sh "$PACKAGE")
+
+jq --indent 4 --argjson repl "$NEW_JSON" ".\"$PACKAGE\" *= \$repl" "$FILE" > "$FILE".new
+mv "$FILE".new "$FILE"
+
+echo "-- * -- Updated $FILE"