This rebrands the two under the "HANDHELD" name. The two platforms now
function identically in regards to server functions, making them
unified in behavior and general server-reliant functions.
Adds some utility functions to make grabbing specific pieces of weapon
information in any of a player's slots easier. Fixes some mulekick bugs
as a side effect. Fixes https://github.com/nzp-team/nzportable/issues/52.