Added low memory overhead option.
This new setting will enable the main hub map, Westminster to be streamed in over 12 seconds. I noticed a huge memory spike when transitioning to Westminster that could occasionally lead to an out of memory crash on systems with less RAM or VRAM.

The map is the same, it's just been chopped up into small chunks that are loaded in sequentially, memory is flushed between each chunk to ensure the loading system isn't getting overwhelmed when clearing old and loading new data in for gameplay.

I recommend leaving this off if you can, it will cause a 12 second load screen every time you enter Westminster, but it will help if you ever get hard crashes due to running out of system memory. It also lessens the impact of page file transfer, which can lead to massive slowdown for a minute or so on level loads.

• Fixed mannequins waking too early in the Theatre.
  
• Added drop prompt to inventory when using KB&M.
  
• Lots of memory optimisations throughout the game.

I'll be checking the boards over the next few days to be sure I didn't introduce new bugs with my changes, so please report if you find anything!

Thank you!
Nathan