add option: frozen players needs to press twice 'move' keys to dodge

This is a small option to toggle whether frozen players are able to dodge without typing the movement key twice. It is disabled by default because frozen player could move too freely and it changed the original gameplay where teamplay was more favored. As I wrote this patch I normalized the placement "tap_direction" and "last_time_X" so all "if" blocks looks the same (should be refactorzed by the way).

Extended message:

    add autocvar: sv_dodging_frozen_autorepeat
    uniformize when last_X is set (all the same)