Teamed items fixes and Q3 compatibility
Add support for teamed items on Q3 maps by using fullspawndata
Closes #2368 (closed)
Fix bug where ReadyRestart could cause teamed items to all spawn together
For weapons this was subtle: ghost item(s) would appear as well as the item selected to spawn.
For powerups they would all spawn at once, and/or previously scheduled spawns were not cancelled.
Fixing this requires leaving the first of the teamed items marked so Item_FindTeam() will do its job again at ReadyRestart. This requires changing the abused effect field to a bitmask other than EF_NODRAW so that DP will draw the ghost for the marked item.
Some minor cleanups to Item_FindTeam() are included.