extended EXTI::Periph

Signed-off-by: Tolga HOŞGÖR <fasdfasdas@gmail.com>
unimportant changes

Signed-off-by: Tolga HOŞGÖR <fasdfasdas@gmail.com>
EXTI progress

Signed-off-by: Tolga HOŞGÖR <fasdfasdas@gmail.com>
basic LCD and some other changes

Signed-off-by: Tolga HOŞGÖR <fasdfasdas@gmail.com>
made EXTI::getPeriph return pointer for easier debugging and syntax uniformity

Signed-off-by: Tolga HOŞGÖR <fasdfasdas@gmail.com>
SCB progress and other changes

Signed-off-by: Tolga HOŞGÖR <fasdfasdas@gmail.com>