l2cap: trigger connection also read remote extended features complete event

fix warnings

GAP: gap_set_security_level sets required security level for incoming and outgoing connections

l2cap: append new created channel entries at the end of the list to preserve order of first signaling response

l2cap: send extended features request only once per hci connection

l2cap: revert 5fe48d6 due to regression

l2cap: revert 5fe48d6 due to regression

l2cap: fix unused var in l2cap_run

l2cap: extract l2cap_run_for_classic_channel_ertm

l2cap: move can send acl packet now check in front of switch of l2cap_run_for_classic_channel

l2cap: split l2cap_run into sub statemachines

hci: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections

l2cap: request security level 2 for both SSP and non-SSP connections

l2cap: fix compile

l2cap: extract l2cap_acl_classic_handler_for_channel

l2cap: remove unneccessary break

l2cap: extract l2cap_run_for_classic_channel

l2cap: reduce level in l2cap_run for ertm handling

l2cap: use remove channel from linked list without iterator

l2cap: avoid read-after-free on decline of incoming connection with ERTM enabled

l2cap: fix creation of multiple outgoing l2cap channels (pull request #205)

MISRAC2012-Rule-14.4_d: use while(true) instead of while(1)

ignore memcpy return value (always returns first parameter)

ISRAC2012-Rule-12.1: add suggested parentheses

ISRAC2012-Rule-12.1: add suggested parentheses