PACKET_LOSSY_AV_RESERVED 8 # why?

[iphydf]

Based on #610.

c-toxcore/toxcore/Messenger.h

Line 70 in 0542ffa

#define PACKET_LOSSY_AV_RESERVED 8 /* Number of lossy packet types at start of range reserved for A/V. */

why are there 8 packet types reserved for A/V ? are there more than 2 actually used?