Optimization and minor update

Added stats panel on the pause menu in game

Made player's health show on the top layer so that it is no longer blocked

The health is now shown with "k","m","b" once it exceeds 1000. (1.5k, 2.6m etc)

Swords performance optimization

Swords audio optimization

Fixed the bug that swords in cooldown still dealt damage when player hits enemy

Fixed the error of blue bow mesh display

Added fixed camera option in the settings

Fixed the wrong description for level 4 blue sword，Sword Speed+5 -> Sword Speed+0.5 （doesn't affect the actual speed increase, just fixing display error）

Fixed some other bugs