SMS Version 2.7 Update

JK this update will be the last till Version 3 lol. I had to add some features and fixes that really finalizes this version of the game:

- New UI In Armory and Target Practice Menus 

- 22 New Challenges (All can be found in the Challenges tab in the Armory) 

- The ability to Duck and Dive (Used with the spacebar. Controls can be found in the settings) 

- Slower fire rate for the boss's attacks 

- An arrow will point to the closest targets when there are fewer than 20% of the targets in the level 

- Timer and Score will turn red when 10 seconds or 10 Targets are left

- Marine and enemy bullet hitboxes edited for less frustration

- A bunch of bugs I don't remember fixing because there was quite a few