Access incs

access_incs is used to sequence the key-card access display. This is a count-up timer which increments itself once per tic if its value is greater than 0. During this time, the access card animation is displayed on screen. Once access_incs's value reaches 12, the bit for the access card currently in use is unset from got_access and access_spritenum is reset to -1. Once access_incs reaches 21, weapon_pos is set to 10, kickback_pic is set to 0 and access_incs is reset to 0.