Summary: Work-in-progress data for Speed Dreams

Description:
Work-in-progress data for Speed Dreams
- new tracks : dirt-1, dirt-2, dirt-4, dirt-6, mixed-1, mixed-2,
e-track-2, e-track-3, e-track-4, e-track-5, spring, street-1, wheel-1,
a-speedway, b-speedway, c-speedway, d-speedway, e-speedway, f-speedway,
caddo, sunshine, tennessee
- new cars : ls2, mp5, rs series
- new robots : simplix_ls2, usr_ls2, simplix_mp5, usr_rs
- adds mod: career

Maintainer: akien