Demo Update 4

added Machine Gun
added Super Shotgun
increased enemies size
added more small tutorials for guns&movement and list all of them on pause menu
performance improvements especially when high number of pickups dropped around
improved camera shakes for everything related to weapons
improved muzzle flashes
Winchester: increased projectile size for easier enemies hit, reduces base spread
Grenade Launcher: added spikes to projectiles for easier physical hits, ADS now impacts fire rate and projectile speed (hence phys hit damage)
Pistol: ADS now increases fire rate
Improved some sounds
fixed bugs