SIPVicious OSS 0.3.8

Maintenance release.

• Packaging: replace the deprecated GPL license classifier with the SPDX expression GPL-2.0-or-later (#87)
• Documentation: refresh README links and installation notes for the current wiki and DVRTC tutorial
• Documentation: rename installed man pages and examples to use the sipvicious_sv* console scripts
• Documentation: sync wiki usage pages, installation guidance, optional dependencies, and FAQ links
• Change: refresh copyright notices and related date metadata through 2026

Full Changelog: v0.3.7...v0.3.8