add preliminary full-screen impl
capture main thread id in NPP_New
use npn.pluginthreadasynccall instead of ppb_core_call_on_main_thread
remove unused fields from struct pp_instance_s
use structure assignment in ppb_core_call_on_main_thread
ppb_instance_private_execute_script: call X functions on main thread
reflow full screen handling thread
ask NETWM enabled WM to make window fullscreen