* add skidtime, which we forgot before 2.1 release apparently
* change tics from INT16 to INT32
* change eflags from UINT8 to UINT16
* change actionspd/mindash/maxdash from INT32 to fixed_t
*player->health (formerly the "HUD" health) is now to be known as player->rings, and now acts as the player's actual ring count
*player->mo->health (formerly rings + 1) is now always 1 when alive, regardless of ring count; if player with rings is damaged, this is untouched
Damage in normal SP/Coop gameplay has been tested and still works fine; still a lot of mess to clear up though
Tag damaging probably is broken now, I'll fix this later
