accommodate for sdk api change

Make a call to the payload entry point rather than just setting the instruction pointer register. This fixes a stack pointer issue when sending some payloads compiled with optimizations

use sceKernelSpawn to spawn new processes, which fixes resource starvation when many payloads are launched

A major rework of the elf loader, which fixes sever bugs

Improve stability and lots of cosmetics

Minor fixes and cosmetics

do some cleanup before termination

Ensure the elf loader resumes execution after the PS5 returns from rest mode