bt_control: remove valid field

chipset: remove all chipset functions from btstack_control.h and use from hci.c

hci: add hci_set_chipset and set it for all ports

hci_cmds -> hci_cmd

use hci_transport_TYPE_instace() consistently. Fix iOS port build

fix missing bstack_ for struct data_source and struct timer. utils->btstack_util

prefix data_source_t and timer_source_t with btstack

prefix run_loop_ functions with btstack_

forgot to add files in earlier commit

run_loop.h -> btstack_run_loop.h

prefix debug with btstack_

hci_trasport: add type to hci transport config, update all ports

run_loop: pass in run_loop_X_get_instance() to run_loop_init(). Various other fixes

move run loop embedded specific functionality to run_loop_embedded.h

embedded_ -> run_loop_embedded_

Merge branch 'master' into ble-api-cleanup

integrate gap_le.h into gap.h

fix paths after source reorg

separate platform specific code and ports for a particular setup