Patch notes for v0.8.7b

Simulation determinism

• All simulation math now runs on a pure-integer arithmetic, so results are bit-identical across CPU vendors and machines.
• Fixed vehicle path-finding that could finish on different ticks on different machines.
• Fixed ship path-finding behaving differently depending on whether the pathability overlay was open.
• Fixed terrain props (rocks, bushes) generating non-deterministically.
• Fixed erosion particles overshooting their step during map generation, which could reach far enough to cause a race conflict with a chunk generated on another thread (this fix applies only to newly created games, existing saves are unchanged).
• Terrain generation now computes a fingerprint that is checked on load, reporting a warning on mismatch. Added the print_terrain_fingerprint console command for bug reporting.
• Fixed the cut & paste tool destroying entities outside of the simulation. The consequence is that the paste placer now opens one tick later.
• Fixed prototype initialization order depending on the operating system's locale.
• Fixed equidistant or equal-priority candidates being non-deterministically picked by internal collection order. Tree, chunk and forestry tower selection, truck and buffer assignment, and train dispatch orderings now break ties deterministically.
• Stacker tower tip paths are now ordered deterministically without floating-point math.

Performance

• Fixed dictionaries and sets keyed by tile positions sometimes degrading into linear scans due to unfortunate hash collisions. Worst-case lookups are now 2-3x faster.
• Terrain props are ~4x faster to generate.

Fixes

• Fixed an error in the in-game hub's markdown viewer caused by multiple font requests.
• Fixed images floating in hub text being removed; they are now shown below the text instead.
• Improved image alignment in the in-game hub and updated the links on the main screen.