Remove unused and unneeded functions, also create Pin.get_config() that
returns the whole configuration of the pin.
This reduces code size by ~500 bytes.
This has implications all over the place. I have to admit that
you can instantly see that usability improves, but it costs 3K.
At the same time I took the oportunity to rename the '/SFLASH'
drive to '/flash' which improves compatibility with the pyboard.
This change helps making the cc3200 port API a bit closer to stmhal.
The ramaining differences are due to the specific hardware details
of each chip. One feature that has been deliberately disabled is the
possibility to add custom names and custom pin mappings. Those
features are nice and convenient, but in this port, code size is a
major concern.
The port currently implements support for GPIO, RTC, ExtInt and the WiFi
subsystem. A small file system is available in the serial flash. A
bootloader which makes OTA updates possible, is also part of this initial
implementation.
