New update and Mac OS support

Hi.

Version 1.3 is released, and there are the following changes:

• Mac OS Support

Some changes:

• Changed some sound effects

• Kill counter in Survival mode

• A few changes in the interface

• Units limit increased from 12 to 16

• Now turrets and walls can be built during construction or upgrade

Fixes:

• Fixed Invincible units

• Fixed a bug with bullets which changed its direction

• Fixed a bug that resulted in stopping waves of enemies in the survival mode

• Debug console no longer appears when you press F12

• Fixed a bug due to which the last secret level in Survival mode could be unlocked only on "Game Over" screen

• Fixed a bug when Carrier did not produce new Bombers.