[cmake, tools, docs] Update CPMUtil (#2790)

updates CPMUtil to
[`8f9b39fc98`](8f9b39fc98)

Makes the tooling/docs better and enforces usage of tar.gz everywhere as
opposed to zips

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

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2790
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

docs/CPMUtil/README.md

@@ -0,0 +1,46 @@
+# CPMUtil
+
+CPMUtil is a wrapper around CPM that aims to reduce boilerplate and add useful utility functions to make dependency management a piece of cake.
+
+Global Options:
+
+- `CPMUTIL_FORCE_SYSTEM` (default `OFF`): Require all CPM dependencies to use system packages. NOT RECOMMENDED!
+  * You may optionally override this (section)
+- `CPMUTIL_FORCE_BUNDLED` (default `ON` on MSVC and Android, `OFF` elsewhere): Require all CPM dependencies to use bundled packages.
+
+You are highly encouraged to read AddPackage first, even if you plan to only interact with CPMUtil via `AddJsonPackage`.
+
+<!-- TOC -->
+- [AddPackage](#addpackage)
+- [AddCIPackage](#addcipackage)
+- [AddJsonPackage](#addjsonpackage)
+- [Lists](#lists)
+<!-- /TOC -->
+
+## AddPackage
+
+The core of CPMUtil is the [`AddPackage`](./AddPackage.md) function. [`AddPackage`](./AddPackage.md) itself is fully CMake-based, and largely serves as an interface between CPM and the rest of CPMUtil.
+
+## AddCIPackage
+
+[`AddCIPackage`](./AddCIPackage.md) adds a package that follows [crueter's CI repository spec](https://github.com/crueter-ci).
+
+## AddJsonPackage
+
+[`AddJsonPackage`](./AddJsonPackage.md) is the recommended method of usage for CPMUtil.
+
+## Lists
+
+CPMUtil will create three lists of dependencies where `AddPackage` or similar was used. Each is in order of addition.
+
+- `CPM_PACKAGE_NAMES`: The names of packages included by CPMUtil
+- `CPM_PACKAGE_URLS`: The URLs to project/repo pages of packages
+- `CPM_PACKAGE_SHAS`: Short version identifiers for each package
+    * If the package was included as a system package, ` (system)` is appended thereafter
+    * Packages whose versions can't be deduced will be left as `unknown`.
+
+For an example of how this might be implemented in an application, see Eden's implementation:
+
+- [`dep_hashes.h.in`](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/src/dep_hashes.h.in)
+- [`GenerateDepHashes.cmake`](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CMakeModules/GenerateDepHashes.cmake)
+- [`deps_dialog.cpp`](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/src/yuzu/deps_dialog.cpp)