refactor: use unattended windows installation by default

Create unattended windows installation iso by default when creating
windows vms with --create-config.
To disable, pass --disable-unattended

https://github.com/quickemu-project/quickemu/pull/1373/files#r1673481239

Co-authored-by: Liam <33645555+lj3954@users.noreply.github.com>

quickget

@@ -3333,18 +3333,16 @@ function create_config() {
         *windows-server*|*eval_oemret_x*|*eval_x*) CUSTOM_OS="windows-server";;
         *windows*|win*)
             CUSTOM_OS="windows"
-            while [ $# -gt 2 ]; do
-                case "${3}" in
-                    -unattended|--unattended)
-                        echo "Downloading VirtIO drivers..."
-                        web_get "https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/stable-virtio/virtio-win.iso" "${VM_PATH}"
-                        FIXED_ISO=${VM_PATH}/virtio-win.iso
-
-                        rm -f "${VM_PATH}/unattended.iso"
-                        unattended_windows "${VM_PATH}"
-                        shift
-                esac
-            done
+            # Older windows 10 ISOs use the year followed by the month rather than the year & half). Match any text for language.
+            if [ "${3}" != "--disable-unattended" ] && ( [ "${3}" == "--unattended" ] || grep -E -q 'Win(10|11)_([0-9]{2}H(1|2)|[0-9]{4})_[^.]*?(x64|x32)(v[0-9])?.iso' <<< "${INPUT}" ); then
+                echo "Creating unattended Windows installation files. To disable, pass --disable-unattended"
+                echo
+                echo "Downloading VirtIO drivers..."
+                web_get "https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/stable-virtio/virtio-win.iso" "${VM_PATH}"
+                FIXED_ISO=${VM_PATH}/virtio-win.iso
+                rm -f "${VM_PATH}/unattended.iso"
+                unattended_windows "${VM_PATH}"
+            fi
             ;;
 
         *) CUSTOM_OS="linux";;
@@ -3397,7 +3395,7 @@ Arguments:
   --help                                   : Show this help message
 ------------------------------------ Flags -------------------------------------
 --create-config:
-  --unattended                             : Unattended windows installation
+  --disable-unattended                     : Force quickget not to set up an unattended installation
 -------------------------- For testing & development ---------------------------
   --url           [os] [release] [edition] : Show image URL(s)
   --check         [os] [release] [edition] : Check image URL(s)