[avatar] Added drop(slot) method.
[avatar] Drop all equipments upon death.
Prees tab to see your equipment as well.
Player slash hitbox is bigger now.
Added the concept of weapon weight.

For now, attack shoving depends on the formula:
  (atk + wgt*2)/3
Wall bouncing has not been revised yet.
Adjusted wall bounce formulas to use wepon weigth.

The bounce impulse is inversally proportional to your weapon's weight.
Tuned more the shove formulas.
Merge branch 'dmgstuff'