V1.1 bug fixes, features and cosmetic updates

Bug fixes:

• Fixed sprint canceling after pressing use/interact key
• Fixed shotgun accuracy issue during ADS
• Fixed player flying up at the top of stairs by applying downward force
  
• Fixed cursor flicker at start of game
• Fixed unoptimized water effect causing performance issues

Features added:

• Holding middle mouse button moves player at half speed
• Enemies move randomly when unable to get to player for realism

Cosmetic updates:

• Added AO effect under the hand gripping the pipe wrench
• Boosted the contrast, saturation and color grading effects
• Cleaned up normal maps and textures
• Fixed flickering light issue by using cookie texture