Can't Remove Kernel Extensions Under Mojave
As the developer responsible for that KEXT, I'm sorry that it's crashing.  You did the right thing just deleting it; it isn't going to be updated for Mojave (because, frankly, there's no point; what with APFS and the various security changes, I'm afraid iDefrag is now a legacy-only product).

For anyone else seeing this problem, you can boot into Safe Mode by restarting your machine and holding Shift (the key marked ⇧) when you hear the boot chime.  Alternatively, you can boot into Recovery Mode by holding Command (⌘) and R when you hear the chime; if you're in Recovery Mode, you can open Terminal from the "Utilities" menu at the top of the screen.

To delete the KEXT, follow the instructions below:

From Finder


In Finder, choose "Go to Folder…" from the "Go" menu.
Enter /Library/Extensions into the box that appears.
Press "Go" (or hit Return).
Drag the CoriolisSnapshot.kext to the Trash (or choose "Move to Trash" from the "File" menu).


From Terminal


Enter sudo rm -rf /Library/Extensions/CoriolisSnapshot.kext at the prompt, and press Return.
If prompted, enter your password and press Return.