3 new opcodes: push/pop es, push fs. Added support for ES: override in emu_cpu_step
added: emu_memory_segment_setval/getval ,
added: .segs debug shell function,  gui_launcher.more.Disasm
test: scdbg /wstr 0x401000-0x64A130000000060fa00731C026A13000000090  -vvv -nofile