Add a vanilla like gun turret 2 and research to the game.

• Technology prerequisites: gun-turret, engine, military-science-pack
• Dimensions: 3x3
• Ingredients: 1 gun turret, 16 steel, 10 iron gear wheel, 4 engine-unit
• Production time: 20s
• Health: 1200
• Range: 24 (configurable in mod-settings)
• Fire rate: 20/s
• Stack size: 50 (configurable in mod-settings)
• Languages: af, ar, be, bg, ca, cs, da, de, el, en, eo, es, et, eu, fi, fr, hr, hu, id, is, it, ja, lt, lv, nl, no, pl, ro, sk, sl, sq, tr, vi

For Space Age see heavy_gun_turret mod by Talandar.