Cavern 1.3 - HRIR and Cavernize Lite update

Additions

• HRIR-based headphone virtualizer
• Cavernize Lite is now open source and included in this repo
• Variable band smoothing
• Implemented more Unity functions
• Support for virtual, even streaming audio sources with forced playback
• Noise generator audio source

Changes

• Greatly optimized code
• Virtualization does not override echo settings for audio sources
• The default sample rate is now 48 kHz (which is the sample rate of the HRIR)
• New set of supported DCPs