User-provided alternate Unstoppable recording

Input: f_unstoppable.wav, supplied by the mod author in this conversation.
Adapted asset: assets/gravitonarmor/sounds/aura/unstoppable_rare.ogg

Changes: 65 Hz high-pass, short click-prevention edge fades, fixed gain
matched to the existing Unstoppable recording, resampling to 44100 Hz,
mono Ogg Vorbis encoding. No pitch change, synthesis or voice cloning.

The supplied file contains no author or license metadata. Its original
creator, source and redistribution terms have not been established.
It is NOT part of the VoiceBosch WARLORD pack and is NOT represented here
as CC BY-SA licensed. Confirm its source and redistribution permission
before including this alternate recording in a public release.

The existing WARLORD credits and license remain in AURA-WARLORD.txt.
