Update: Randomly-Generated Levels

Took me long enough! (Probably would've helped if I was actually working on it for all that time.)

Patchnotes:
Added randomly-generated levels to clear, with new rooms.
Added a 'Home Ship' area between levels, marked by blue walls. This has its own xenocap, and a terminal for changing levels.
The terminal also includes a scorecard, for listed activities. (Items to spend credits on are not yet implemented.)

Fixes:
Fixed some of the issues with the walk-cycle.
Fixed 'puffballs' being born eunuchs who hack and cough when fed Breeder's Bliss.
Fixed 'friends' being born with quantum entanglement, allowing them to jump in mid-air.
Fixed the Plugs tab breaking when opening the pause menu, if it was open when hitting Escape.
Fixed 'breeders' getting scoliosis when looking to the left.
Fixed some jitter/pausing issues when affected by 'gravid' slowdown.
Fixed the liquid plug from the Xenocap running while the pause menu is open.

Minor Changes:
Added a minor safeguard for 'friends' getting stuck inside the floor.
Added a black screen behind the menu on startup.
Added a minor safeguard for untracked 'friends' sending Mel's corporeal form to the shadow realm.
Blatantly avoided adding new sprite assets whenever possible.