[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/ffmpeg/cpmfile.json

@@ -5,17 +5,17 @@
         "hash": "2a89d664119debbb3c006ab1c48d5d7f26e889f4a65ad2e25c8b0503308295123d5a9c5c78bf683aef5ff09acef8c3fc2837f22d3e8c611528b933bf03bcdd97",
         "bundled": true
     },
-	"ffmpeg-ci": {
+    "ffmpeg-ci": {
         "ci": true,
         "package": "FFmpeg",
         "name": "ffmpeg",
         "repo": "crueter-ci/FFmpeg",
         "version": "8.0",
         "min_version": "4.1",
-		"disabled_platforms": [
-			"freebsd-amd64",
-			"solaris-amd64",
+        "disabled_platforms": [
+            "freebsd-amd64",
+            "solaris-amd64",
             "macos-universal"
-		]
+        ]
     }
 }