test/mesh: fix `sbc_encoder.h not found` by including ./3rd-party/bluedroid/* (#591)

test: use pkg-config to find cpputest in CMake builds

Avoid __ prefix in defines

test: use pkg-config for cpputest build flags

mesh: move gatt services into mesh/gatt-service folder

docu: remove mapping of 300/600 baud to 2/3 mbps for posix targets

test: avoid HCI_EVENT_IS_COMMAND_COMPLETE macro

port: use btstack_strcpy and btstack_cat instead of strcpy/strcat

test: only compile CppUTest files with c++ compiler

test; fix build

test: fix build

hci_dump: enable packet logger in tests

hci_dump: disable hci_dump for ports and tests

btstack_uart: add NULL for SLIP function in existing uart implementations (avoid warnings)

Remove btstack_run_loop_base from port and test

test: add run loop base

fix builds: libusb cmake, tool/metrics, test/mesh