Milestone 3.4.0 Released! (Experimental) — Xenonauts 2 Steam update #391745

This update is also only accessible by switching to our Experimental branches (instructions on how to do so here) - although note they have slower load times and worse performance than normal builds due to the extra logging they contain! Another quick batch of fixes for Milestone 3 while we continue to work on Milestone 4. Gameplay Changes: Mentarch can now be suppressed again. However, it now has 80 Bravery instead of 50 Bravery so it is harder to suppress than it was in Milestone 2. Added correct white silhouette images for the MARS vehicle weapons (used in the unit minitabs at the top of the tactical UI). Bugfixes: Fixed a crash that could occur when quickly switching between the aircraft screen and another strategy screen. Fixed the player being able to hire more engineers / scientists than their workshop / lab capacity should allow if you have excess lab capacity free at a secondary...