disp_util: init asio in ctor so get_io() can be called disp_setup()
boda_base: copy some functions from cap_app to a better home. note: compilition is probably broken in this commit since cap_app isn't updated yet.
cap_app: remove dup'd functions. remove shm_seg experiment. use asio to share a p_uint8_t for cs_disp/display_ipc.