[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>

externals/libusb/cpmfile.json

@@ -1,8 +1,9 @@
 {
-	"libusb": {
-		"repo": "libusb/libusb",
-		"sha": "c060e9ce30",
-		"hash": "44647357ba1179020cfa6674d809fc35cf6f89bff1c57252fe3a610110f5013ad678fc6eb5918e751d4384c30e2fe678868dbffc5f85736157e546cb9d10accc",
-		"find_args": "MODULE"
-	}
-}
+    "libusb": {
+        "repo": "libusb/libusb",
+        "tag": "v%VERSION%",
+        "hash": "98c5f7940ff06b25c9aa65aa98e23de4c79a4c1067595f4c73cc145af23a1c286639e1ba11185cd91bab702081f307b973f08a4c9746576dc8d01b3620a3aeb5",
+        "find_args": "MODULE",
+        "git_version": "1.0.29"
+    }
+}