mantis's improvements

Map	Style	From	To	Improved by	Date
mg_kc_course	Normal	0:53.523	0:47.703	−5.820	1 Nov
mg_sonic_course	Normal	1:00.025	0:34.766	−25.260	24 Oct

Improvements from before 26 Oct 2026 are estimated from old database backups; some may be missing.