external_access: Rename the Python server

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f405_gpio: Change when the include files are included

Signed-off-by: Alistair Francis <alistair23@gmail.com>
extnernal_access: Allow server support for PWM

Signed-off-by: Alistair Francis <alistair23@gmail.com>
stm32f405_timer: Add support for PWM external access

Signed-off-by: Alistair Francis <alistair23@gmail.com>