Leaky Dam update 1.1

Bug Fixes:

- Fixed a bug where the bear would still attack the player during winter if there dam had no water

- Fixed a bug where the bear would become invisible if the player led it through a bear den

- Fixed a bug where the rat would take away wood even if it already had wood

- Fixed a bug where the year amount would be hidden during Game Over screen

Added

- Pause Menu(escape button)

- High Score system 

- Player now has to press a button to continue in Game Over screen

- Walk and Swim sound effects