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To partly address Issue #220.

This reverts commit a215b09c.

* Move gc_collect from main to py/gc.c
* Define GC's memory boundaries in linker script
* Issue #220

* Fix PCGCCTL bug using address instead of value.
* Fix issue #211

* Move RTC code from main to a separate module.

* Add MICROPY_HW_HAS_LCD
* Add MICROPY_HW_HAS_WLAN
* Use feature test macros in main

* Add some generic feature macros to mpconfigport
* Move pin and port definitions from usrsw.c to mpconfigport

f2d and d2f functions from libgcc does not work correctly, most likely
due to the ABI being incorrect.  libgcc disabled for now.

mpconfigport.h is now included by stm32f4xx.h so that all STM files have
access to these defines.

Can now have null bytes in strings.  Can define ROM qstrs per port using
qstrdefsport.h

* Add the option to pass OSC frequency on command line.

CMSIS V3.01 -> V3.20. Now in stm/cmsis to keep separate from ST
libraries.

Byte code has a map from byte-code offset to source-code line number,
used to give better error messages.

Parser no longer prints an error, but instead returns an exception ID
and message.

Thanks to Dave Hylands for this.

* Add ADC support for reading internal temperature sensor.
* Add ADC support for reading internal VREF/VBAT monitor.

* Add simple ADC driver, with support for ADC1 and all channels.
* Export MicroPython ADC object with read_channel function.
* Add stm32f4xx_adc.c and adc.c to Makefile.

* Add missing ADC driver from STM32F4xx_StdPeriph_Lib_V1.3.0