Confirm action in Farming screen added

Minor update - based on feedback I've added a confirmation for Farm actions.

By default all actions are blocked, player has to select 'yes' by moving joystick right (or pressing 'd') for any actions to be put in the queue.
In case of farming itself, default crop selection is set to 'empty', so player has to manually choose a crop before he will be able to undertake that action.

Build available on our Discord channel, as it's considered unstable - Wharf is 'in progress' and currently crashing the game.