Run on Windows, bug fixes

• Improvement: Add direct download links to the microwave documentation
• Improvement: Start microwave with no CLI parameter s.t. users can double-click the executable
• Bug fix: microwave was not able to start on Windows
  • Build with MSVC toolchain
  • Fix #38
• Bug fix: Rotary effect was broken
  • DelayLine had off-by-one error. Added automated tests.
• Bug fix: Audio-in was broken
  • When microwave started to use cpal instead of nannou-audio, cpal's variable buffer size model was not considered in the audio-in model