Waypoint on items

Make so that g_waypointsprite_team_here_p's trace hits map items, matching item detection of the placeholder %x in the text message "free item %x^7 (l:%y^7)"

There're other commands where g_waypointsprite_team_here_p is used though:

seta "userbind2_press" "say_team free item %x^7 (l:%y^7); g_waypointsprite_team_here_p";  seta "userbind2_release" "";  seta "userbind2_description" "team: free item, icon"
seta "userbind8_press" "say_team flag seen (l:%y^7); g_waypointsprite_team_here_p; cmd voice seenflag";  seta "userbind8_release" "";  seta "userbind8_description" "team: flag seen, icon"
seta "userbind12_press" "say_team killed flagcarrier (l:%y^7); g_waypointsprite_team_here_p"; seta "userbind12_release" ""; seta "userbind12_description" "team: killed flagcarrier, icon"