Add melee "mode" aka fist fight

[honzakotrs]

• weak attack (minimum power)
• very short distance of "shots"
• the attacked player would get moved a bit in the direction of a punch
• fast reload
• automatically enabled when no shots are available
• ideally add a distinct animation for every weapon (for melee fight)

[marcellus-trixus]

• I would add a lot of movement of an opponent (like punch in worms) or a lot of damage (with longer cooldown) to make sense.
• distinct animation would be a lot of work...i think throwing weapon and pulling up hands would be both much more "action-like" and also easier to implement :-)