[crossfire] New movement code.

[Brendan Lally]

On 10/16/05, Todd Mitchell <
     temitchell at sympatico.ca
     > wrote:
>
      I would advocate that only  the shallow sea should be swimmable.
     
Could seas use the same approach as swamps? That when a player starts
walking into them, they stand a chance to sink slightly, and if they
keep going, they die? This would effectively stop long distance
swimming

Obviously the messages would need to change appropriately:
"You glide comfortably through the water"
"You feel your legs start to get tired"
"You struggle to keep your head above water"
"You gasp for breath, and in the process swallow lots of water"
"You are drowning"