l2cap: fix event forwarding failure by previous commit

hci: use btstack_packet_handler_t for acl and sco callbacks

don't emit X_EVENT_CAN_SEND_NOW if x_can_send_now returns false

l2cap: add l2cap_request_can_send_now_event and don't send L2CAP_EVENT_CAN_SEND_NOW on channel open

gap: pass le_connection_parameter_range_t as pointer

event: introduce hci_event_packet_get_type

use hci_con_handle_t more

gap: declare more hci functions as gap functions

hci_transport: send HCI_EVENT_TRANSPORT_PACKET_SENT when buffer can be re-used, send HCI_EVENT_SCO_CAN_SEND_NOW if that's separate

gap.h: use gap_ instead of le_central_ or gap_le_

hci: COMMAND_COMPLETE_EVENT->HCI_EVENT_IS_COMMAND_COMPLETE. COMMAND_STATUS_EVENT->HCI_EVENT_IS_COMMAND_STATUS

bt_flip_addr(dest,src) -> reverse_bd_addr(src,dest)

util.h: use lower case for bd_addr_copy and bd_addr_cmp

att_dispatch: forward L2CAP_EVENT_CAN_SEND_NOW to ATT Client & Server

l2cap: emit L2CAP_EVENT_CAN_SEND_NOW also for registered fixed channels

hci: extracted hci_number_free_acl_slots_for_connection_type

l2cap: add fixed l2cap channel id to l2cap_can_send_fixed_channel_now

l2cap: use table for fixed channels

l2cap: emit L2CAP_EVENT_CHANNEL_CAN_SEND_NOW after open or failed l2cap_can_send_now(..) request

hci/sm: use btstack_packet_handler instead of (*fn)(type,packet,size) for events

l2cap: don't forward HCI to l2cap packet handler. Replace l2cap_register_packet_handler with hci_add_event_handler. Fix tests

l2cap: replace l2cap_dispatch with l2cap_dispatch_to_channel

l2cap: don't forwared HCI Events to L2CAP Connectionless Packet Handler

att_dispatcher: register directly for HCI Events

sm: register for HCI Events directly. don't forward HCI Events to for SM protocol in l2cap