Add GZDoom

[Mr-Bajs]

• [x] I have checked that this app does not already have a pending request and has not previously been declined.
• App Name: DZDoom
• Download URL: https://github.com/ZDoom/gzdoom/releases/download/g4.9.0/gzdoom_4.9.0a_amd64.deb
• Website URL: https://www.zdoom.org/downloads
• Github Website: https://github.com/ZDoom/gzdoom
• App Summary: A game engine under the GPL 3.0 license for playing Doom and Doom mods on a more modern game engine. Requires additional downloads of games to play. This is just the engine.

[github-actions[bot]]

Hello there 👋 Thanks for submitting your first issue to the deb-get project 🐛 We'll try and take a look at your issue soon ⏲

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[botus99]

Just adding some info here...

• Debian package repo: https://debian.drdteam.org

Not to hijack the issue here, but do note that other Doom-related .debs (slade and zandronum notably) are available in this repo that might want to be added to deb-get.