Schwarzerblitz v1.4.7 - cheat codes bug fix, low spec toggle and x64 version

Due to a small coding error, cheat codes stopped working, so I have issued an updated version with the following changes:

[h2]Bug fixes[/h2]

• Title screen cheat codes are working again. I apologize for the inconvenience.
  

[h2]New features[/h2]

• Added a toggle to switch off all stage elements (except water)
  
• Added prompt for launching native x64 build of Schwarzerblitz instead of the usual x86 build (might help with some mismatched Visual Studio Redistributable installations)