v0.13.6 This is a bugfix release. There are also multiple cleanups and minor improvements to the web UI by @norgeous. Resolved issues: * #3262: v0.13.5 -no-upgrade build now requires gcc (by @calmh, reviewed by @AudriusButkevicius) * #3267: Favicon should not be animated (by @calmh, reviewed by @AudriusButkevicius) * #3136: Toggling HTTP/HTTPS breaks GUI/API (by @calmh, reviewed by @canton7) * #3287: Understand older/newer Hello messages (by @calmh, reviewed by @AudriusButkevicius) * Warnings on relay connectivity issues are reduced (by @scienmind)