[Canbus] Now using Cmake and Boardcore namespace

CMakeLists.txt

cmake/boardcore.cmake

src/shared/drivers/canbus/BusLoadEstimation.h

src/shared/drivers/canbus/CanInterrupt.cpp

src/tests/drivers/canbus/SimpleCanManager.h

src/tests/drivers/canbus/test-canbus-2way.cpp

src/tests/drivers/canbus/test-canbus-loopback.cpp