by Pathom SANGWONGWANICH BANGKOK, Thailand (AFP) — As night falls on a bustling junction close to the heart of Bangkok, gangs of young protesters take on police with slingshots, firecrackers and homemade “ping pong” bombs, turning the streets into a battle zone. The student protest movement that gripped Thailand last year with its taboo-smashing demands for royal reform has largely died down, splintered by infighting and left rudderless by the arrest of several key leaders. […]