Baler With Buffer Fix

Mod with fixes for balers with buffer.
- For all baling machines with a buffer, a Ctrl+Y hotkey is added to reload what is collected from the buffer into the main chamber at the player’s request.
- For all balers with a buffer, the contents of the buffer are reloaded before unloading a partial bale.
- For stock John Deere CP690 (and possibly other similar combines), a bug has been fixed due to which, starting from game version 1.9.0.0, unloading an incomplete bale is not available.
- For stock John Deere CP690, removes the lower limit on the amount of cotton in an incomplete bale.
- Not tested in multiplayer, so marked as not compatible.