mint-arena: Fix disabled code for misc_model bounds
mint-arena: Fix Team Arena SP win/lose msg in CTF using q3_ui

The default team is red in Team Arena UI and blue in Quake 3 UI.
So use team from human player.

Backported from Turtle Arena.
mint-arena: Split flag and cube dropping from teleport code

Create new function TossPlayerGametypeItems.

Backported from Turtle Arena.
mint-arena: Separate holdable values from EV_USE_ITEM# events

Makes it easier to find the code when searching for HI_MEDKIT etc.
Allows reordering holdables without breaking using them.

Make the game holdable code more similar to CG_UseItem as well.

Backported from Turtle Arena.