Add WIP cosmic-player

recipes/wip/tools/cosmic-player/manifest

+name=COSMIC Media Player
+binary=/usr/bin/cosmic-player
+icon=/ui/icons/apps/multimedia-photo-viewer.png
+author=Jeremy Soller
+description=COSMIC Media Player
+accept=*.avi
+accept=*.mkv
+accept=*.mov
+accept=*.mp4
+accept=*.ogv

recipes/wip/tools/cosmic-player/recipe.toml

+[source]
+git = "https://github.com/pop-os/cosmic-player.git"
+branch = "master"
+
+[build]
+dependencies = [
+    "ffmpeg6",
+    "liborbital",
+    "llvm",
+    "mesa",
+    "sdl2",
+    "zlib",
+]
+template = "custom"
+script = """
+unset CC
+cookbook_cargo --no-default-features --features static --verbose
+mkdir -pv "${COOKBOOK_STAGE}/ui/apps"
+cp -v "${COOKBOOK_RECIPE}/manifest" "${COOKBOOK_STAGE}/ui/apps/cosmic-player"
+"""