v0.12.0.0-rc1

• New: Lanczos and 4-term Blackman-Harris window function.
  • The latter produces very clean peaks with minimal leakage from strong tones into neighboring bins.
• Improved: Cleaned up the rough edges of the spectrogram.
• Improved: Minor redesign of the Graphs page to make the spectrogram easier to configure.
  • Left/Right and Top/Bottom axis should be more consistent for a horizontal or vertical spectrogram.
• Changed: Made the CPU/GPU use optimization logic less invasive when the visualization is hidden or minimized to react more predictable to track changes and the end of a playlist.