Update version to v3.21.0.0

Fix Yangel bonus, but for real (#2548)

Make Skopos programs a bit less of an upgrade trap (#2566)

Gently encourage the player to actually open the Skopos window (#2560)

Keep track of prelaunch vessels for rollout and dismantle checks (#2544)

Make Skopos programs a bit less of an upgrade trap

Allow selecting DS avionics before it's actually available

Fix some code formatting issues

Make procedural avionics updates work in symmetry.

Move chemical plant to long-term life support (#2518)

Slightly clarify wording on training tooltip, and fix some double spa…

Update README of parts browser (#2554)

Tell the player when a timed contract will begin giving rewards (whic…

Add '[Procedural]' to all ROSolar panel titles in Part Browser (#2520)

Allow for commas in autohire GUI, allow for both errors to show up si…

Raise default height above atmosphere/ground in simulation to be 30000 (

Change CostExporter.csproj output path (#2552)

Fix disconnect between avionics masses in procedural avionics window (#…

Gently encourage the player to actually open the Skopos window

Recalculate training course BP on student removal.

Fix science core power use.

Regenerate ECM configs

Fix double requirement of FO Heavy in polar sat contract (#2543)

Refactor and improve dismantle checks

LPs keep track of prelaunch vessels

Do not report budget estimates if the next item is more than 5 years …

Update version to v3.20.0.0