Surviv.io Zombie Apocalypse v1.3 Release

New update, and this one is nearly as big as v1.1!

• Added Credits page to Main Menu (I gotta take my credit where it's due LOL.)
• Added Discord page to Main Menu (We have a discord server now! YAY!)
• UI/sub-menu font overhauled
• First weapon crate will spawn in faster
• Miscellaneous bug fixes
• Hitboxes reworked - Zombies will have to actually touch your body to damage you, eliminating the "bug" where if they touched your gun, you would be damaged
• Added Pills - Provides an adrenaline boost for 5 seconds, dramatically increasing speed.
• Weapon balancing changes:
  -     M9 fire rate decreased from 0.25 to 0.2
  -     M870 fire rate increased from 1.75 to 1.9
  -     MK12 SPR fire rate increased from 3.6 to 4.4