v2.6.3 for KSP 1.12.x

What's Changed

• Construction times for buildings and for LC modification now takes the previous facility into account, considerably shortening build times, especially for later-tier / higher-cost facilities (albeit increasing per-day outlay, so construction rates less than 100% may be desired; change rate on the Construction tab). This change will only take effect on new constructions by @NathanKell
• Revise resource cost multipliers again due to an oversight re: tooled vs untooled costs by @TwistedGiraffe
• Reduce the rate at which unlock credit is generated by @ppboyle
• Fix airlaunch no longer being active after a revert by @siimav
• Fix leader effects not altering hiring costs (alteration was only cosmetic) by @NathanKell
• Fix copy/paste errors in Venus Surface Exploration contracts by @Amselfass in #2120
• Reduce Astronaut Complex Level 3 upgrade cost and reduce Crewed Lunar funding in exchange by @NovemberOrWhatever in #2124
• Add RP-1 cost multiplier for new fairing side petal option by @ryanc55 in #2123
• Fix an issue with Procedural Avionics "Preserve Dimensions" option where it could lead to more electricity than would fit in the tank by @siimav
• Change "Complete" to "Completes" in the Mission/Proficiency Training UI for clarity by @NathanKell

Full Changelog: v2.6.2.0...v2.6.3.0