Switch Atmosphere clone to Atmosphere-Pro and add exosphere-only build script.

Use the boot-storage branch required for Horizon OC exosphere patches, and provide build-exosphere.sh for compiling just exosphere.bin without a full project build.

build.sh

@@ -45,20 +45,13 @@ SRC="Source/Atmosphere/stratosphere/loader/"
 mkdir -p "build"
 
 ATMOSPHERE_DIR="build/atmosphere"
-ATMOSPHERE_URL="https://github.com/Atmosphere-NX/Atmosphere.git"
+ATMOSPHERE_URL="https://github.com/NaGaa95/Atmosphere-Pro.git"
+ATMOSPHERE_BRANCH="boot-storage"
 
 if [ ! -d "$ATMOSPHERE_DIR" ]; then
     echo
-    echo "*** Cloning atmosphere ***"
-    git clone "$ATMOSPHERE_URL" "$ATMOSPHERE_DIR"
-
-    cd "$ATMOSPHERE_DIR"
-
-    git fetch --tags --quiet
-    LATEST_TAG=$(git tag --sort=-version:refname | head -n1)
-    git checkout -q -b build "$LATEST_TAG"
-
-    cd "$ROOT_DIR"
+    echo "*** Cloning Atmosphere-Pro ***"
+    git clone --depth=1 --single-branch -b "$ATMOSPHERE_BRANCH" "$ATMOSPHERE_URL" "$ATMOSPHERE_DIR"
 fi
 
 DEST="build/atmosphere/stratosphere/loader/"