net-im/purple-googlechat: update to nightly-3d07c3a2463ca7dd47fa89b2ce9f8ffb762b320b and take maintainership

While here:

• Updated PORTVERSION to DISTVERSION
• Added licence files directory

Changelog: https://github.com/EionRobb/purple-googlechat/releases/tag/nightly-3d07c3a2463ca7dd47fa89b2ce9f8ffb762b320b

PR: 288663
Reported by: Atanu Biswas <atanubiswas484@gmail.com> (new maintainer)