Cavern 1.5 - Nearly 5 years update

Additions

• Valley correction in QuickEQ
• Gain and Cavernize filters
• Phase, RT60, and imulse likelyness for impulse responses
• 24-bit support for known formats, WAV reader
• FRD calibration support

Changes

• Impulse responses have way less noise
• Versatile convolution generation
• Headphone virtualization is available outside Unity
• Many refactors