restore item_buff_speed and item_buff_invisibility spawnfuncs
As speed and invisibility buffs were made into powerups in !916 (merged) they lost their item_buff_name spawnfunctions from this macro:
#define BUFF_SPAWNFUNC(e, b, t) spawnfunc(item_buff_##e) { \
this.buffs = b.m_itemid; \
this.team = t; \
buff_Init(this); \
}
I'm uncertain if this is enough to restore all of their lost properties but at least they spawn now.
Speed and invisibility were the only moved buffs from qcsrc/common/mutators/mutator/buffs/all.inc
to qcsrc/common/mutators/mutator/powerups/powerup/{speed,invisibility}.{qc,qh}
and be the only buffs powerups which need these spawnfuncs back.
Test map ez2 which spawns item_buff_speed right at the spawn