Bugfixes, new room modifiers and boss balancing

Fixes

• Added new room modifiers: Hiccups, Lights Out, Nostalgia, Behemoth, Juggernaut, Wet floor, Sixth sense, Numb.
• Released in a previous hotfix: Fallback shaders for some particle effects
• Improved a bit CPU usage of audio loops.
• Fixed some sounds being heard even when volume is set to 0.
• Fixed some attacks being done even when the enemy is frozen.
• Updated Unity to latest version, *should* help with random Mac OSX crashes.
• Fixed mouse cursor being shown right after killing the final boss.
• Fixed minor issue with the wave bar on obelisk rooms.

Balance Changes

• King Blob: Decreased speed and damage of the rotating attack.
• Gunkarr: Decreased damage of the jump attack.
• Audrey: Reduced tentacles health, damage and projectile speed.
• Poloko: The shockwave attack is easier to dodge and deals less damage.
• Adam: Increased damage and range of the fire column attack.
• Percival: Decreased delay before the predictive grenade lob.