fix prototypes for fn()

merge follow-up

Merge branch 'master' into ble-api-cleanup

gatt_client_test: fix c++ warning about narrowing

gap.h: use gap_ instead of le_central_ or gap_le_

att -> att_db

l2cap: add fixed l2cap channel id to l2cap_can_send_fixed_channel_now

gatt_client: 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

use for event types

prefix data_source_t and timer_source_t with btstack

prefix run_loop_ functions with btstack_

forgot to add files in earlier commit

prefixed all linked list types and functions with btstack_

rename bk_linked_list_t to btstack_linked_list_t

prefix linked_list

replace le_command_status_t with regular Bluetooth uint8_t error codes, add le_command_status_t enums to error list

rework SDP Service Record management. Service Records can be stored in ROM, daemon creates records on the heap

fix paths after source reorg

removed btstack/include folder

assert HCI_INCOMING_PRE_BUFFER_SIZE >= 2 for Long Characteristic Reads

fix compile of gatt_client mock

fix compile of gatt_client mock

mock: set max mtu fot att connection

refactored var name, removed printfs