Remove the usage to zp_enemy_arg in most places

Everywhere except the 'basic' algorithm don't really need this
argument. In the beginning I was using it to define some custom
velocities, but in the end tweaking the inner timer on the 'extra' value
for all enemies turned out to be more productive. Hence, remove this
usage almost everywhere and make the code simpler as a side-effect.

The usage on 'basic' is still under revision, just to check if 'homing'
really needs to set a special argument whenever the 'homing' attack
needs this sort of behavior.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

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