STM32L0 support

[CezaryGapinski]

Added support for STM32L0 family.

[FreddieChopin]

If I enable "everything" (the last chip, all clock options, all peripherals, ...), I get following error:

[ 17%] CXX     source/chip/STM32/STM32L0/STM32L0-lowLevelInitialization.cpp
source/chip/STM32/STM32L0/STM32L0-lowLevelInitialization.cpp: In function 'void distortos::chip::lowLevelInitialization()':
source/chip/STM32/STM32L0/STM32L0-lowLevelInitialization.cpp:61:14: error: 'enableHsi48' was not declared in this scope
  enableHsi48();
              ^
make: *** [Makefile:246: output/source/chip/STM32/STM32L0/STM32L0-lowLevelInitialization.o] Error 1

The config file which I used is attached (change extension from .mk.txt to .mk) distortosConfiguration.mk.txt

[CezaryGapinski]

Further to changes from STM32F0 enableHsi48 I prepared patch in last commit. Let me know if it is correct, then I will squash it to base commits.

STM32L083V8 has just 64 KB of flash memory, so test application won't compile.

[FreddieChopin]

STM32L083V8 has just 64 KB of flash memory, so test application won't compile.

Chips should be listed in alphabetical order, so the one which I selected should actually be third from the end, with ...VZ as the last one. I've noticed that the order is wrong in several other places.

Further to changes from STM32F0 enableHsi48 I prepared patch in last commit. Let me know if it is correct, then I will squash it to base commits.

This patch fixes the problem (;

[CezaryGapinski]

Chips should be listed in alphabetical order, so the one which I selected should actually be third from the end, with ...VZ as the last one. I've noticed that the order is wrong in several other places.

Ok, now it should be in alphabetical order ;).

[FreddieChopin]

Merged with one very minor change to getBusFrequency.hpp file (/** ... */ -> /// ...).

Thanks! Now I hope to see a pull request with a new board (;