v15.0.0 for KSP 1.12

Notes

• v15.x is the last line of RO releases compatible with Legacy RP-1.

What's Changed

• Add oxygen gas to HP tanks for the new RCS configs by @TwistedGiraffe in #2850
• Improve mfr naming by @Capkirk123 in #2852
• Deprecate the Engine Pre-cooler and Engine Nacelle. by @arrowmaster in #2793
• Deprecate the SXT LEM if ROCapsules is present by @arrowmaster in #2854
• Add Titan variance configs by @Capkirk123 in #2848
• R-9 configs by @Capkirk123 in #2847

Full Changelog: v14.24.1.0...v15.0.0.0