[cmake] refactor: cpmfile, deps prefetch, force system and more (#322)

CPM Dependencies are now managed in a singular json file, where each can be properly prefetched at-will via `tools/cpm-fetch.sh <packages...>`, or all at once via `tools/cpm-fetch-all.sh`.

Adds docs for CPMUtil as well.

Also adds `<package>_FORCE_{BUNDLED,SYSTEM}` overrides

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: #322
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/android/app/build.gradle.kts

@@ -175,7 +175,10 @@ android {
                     "-DYUZU_USE_CPM=ON",
                     "-DYUZU_USE_BUNDLED_FFMPEG=ON",
                     "-DYUZU_ENABLE_LTO=ON",
-                    "-DCMAKE_EXPORT_COMPILE_COMMANDS=ON"
+                    "-DCMAKE_EXPORT_COMPILE_COMMANDS=ON",
+                    "-DBUILD_TESTING=OFF",
+                    "-DYUZU_TESTS=OFF",
+                    "-DDYNARMIC_TESTS=OFF"
                 )
 
                 abiFilters("arm64-v8a")