Start weeding out alien code in view of functional changes

Description pending
Changelogs
Just in case
Split movement delay and make hunters and sentinels a bit faster
Re-poll observers when an embryo fails to burst
Nevermind then, no \improper
Okay let's try again
Missed that one
Thanks
Remove build delay
Issues
Merge pull request #2090 from dylanstrategie/Alien

Start weeding out alien code in view of functional changes