Update 4

- new weapon added: grenade launcher in slot 6

- new weapon added: futuristic SMG in slot 4

- new weapon added: incendiary grenade

- rebalanced gameplay

- new gameplay options available in title screen

- now you can use spawn menu in any level 

- polished weapon inventory menu

- ammo and player health values are kept in-between level transitions

- minor post-processing improvements and fixes

- new ammo items

- reduced fog in 4th area for better visibility

- fixed sky and background in 4th area

- removed bug with rain spawning in menus

- fixed aiming offset for various weapons

- improved night vision

- rebalanced recoil for automatic weapons

- fixed enemy burning animation and sound

- added blank sandbox room option