RealFuels v15.5.0 for KSP 1.12.x

• Update comments in ResourceHsps.cfg by @Capkirk123 in #312
• Update zh-cn translations by @tinygrox in #314
• Add Continous Integration to the RealFuels Git repo by @StonesmileGit in #321
• Fix PartResource getting wrong part ref when tank is created in symmetry by @siimav
• Fix broken 'ullage' loc string by @NathanKell
• Do not calculate 🐉🧊s (Drag Cubes) unless the relevant debug information is shown by @siimav