games/dMagnetic: Update to 0.35

ChangeLog: https://dettus.net/dMagnetic/

Lots of cleanup. The memory consumption was reduced and the interface between
the frontend and the engine has gotten cleaner. Oh, and there is a more stable
savegame for Atari and Apple available.

PR: 269139
Reported by: dettus@dettus.net (maintainer)