Survival Doom update V0.1.3

Hello! Here TakNof telling you guys the recent done update.

Additions:

• Difficulty selection menu! I know is frustrating to start a match and get completely obliterated by the enemies. Now you can select your more fitable difficulty and have fun!.
• An indicator of the difficulty has been added when you get the score to be fair with the pros  that surpass the higher difficulties of Survival Doom!
• There's now a pause menu!
• The font of the original doom game has been integrated, facilitating the creation of the menus and optimizing space of the game.
• Creating a group of enemies has been simplyfied with the use of groups, now bringing more enemies to the game in large amounts will require 2 lines of code instead of 100. (Haha)
• The ammo logic behind the weapons has been implemented, though the enemy drop ammo logic hasn't been done yet so it doesn't work by now.

Improvements:

• The entire code has been mostly restructurated, better logic has been implemented in order to provide a better experience while playing.
• A debug mode that facilitates the coding of the game.

Fixes:

• The colliders not loading correctly has been solved by improving the load times of the elements of the game.
• The raycaster of the enemies was using unreasonable amount of rays though they were supposed to use only one to track the player.

Bugs:

• The enemies tend to overlap each other,  trying to figure out if it's a logic problem or if it's a collider issue.
• Due the new logic of the code when sorting the order of the elements in the world, some enemies "clip" through the walls. However, I've noticed it's a visual bug, due you can still shoot the enemies that are clipped. I think it has to do with the fisheye effect fixing and the missunderstanding of the distances between enemies and elements of the world.

Things that will be coming in the next update:

• The "options" function of the main menu and the pause menu (sorry).
• A tutorial for the people new to the game.
• More weapons!
• More enemies!
• Enemies dropping ammo for weapons
• More vivid and intresting textures of the walls,  ceiling and floor.
• Many more things!