[stm32f2] fix missing USB symbols
[stm32f3] Properly turn on the FPU

The vector chipset file was added, but not included in the dispatcher.
Fixes github issue #201
[CM3] Fix the set clksource, found and described by ksarkies.
[stm32] Use correct offsets for UniqueID bits

STM32L1 has a different set of offsets, not just a different base
address, so we can't have common registers definitions.  Also, out of
F0,F1,F2,F3,F4,L1, only the F1 has the odd note about 2x16bit registers
and 2x32bit registers with one 16bit register marked as "This field
value is also reserved for a future feature."  Therefore, replace the
awkward reading out as multiple words and just copy them in.

F0,F2,F3,F4 were missing definitions altogether.

This does _not_ attempt to address the problem of the mismatched base
addresses for Medium+ and High Density L1 parts.
Clarify HACKING document

use stdint-types, not short types
remove info on file stucture of examples, this was removed some time ago,
add reference to libopencm3-examples instead.
[stm32] SPI includes got jumbled for for DFF

DFF exists at bit 11 for f1, f2, f4 and l1, but the f0 and f3 have that bit as
CRC len and use CR2 for data size bits instead.  The merging of the F3 and F0
and attempts to put common data in common places broke the l1 code.

F3 and F0 SPI headers are still almost completely identical.
[stm32] Unify f0/f3 SPI and correct all makefiles

The common code wasn't being included in L1 builds, even though the headers now
included the correct definitions.

This combines the two f0 and f3 spi files, which previously differed only in
the number of spi peripherals defined.

Files were renamed to the full "l1f124" style, not because I like it, but
because it's the convention we have, so it's best to apply it rigourously.

Tested on L1 and F100 boards, compile tested only for others, but the examples
repository all compiles too.  (Though the lack of SPI examples for all
platforms was how this broke in the first place)
replaced placeholder __(en|dis)able_irq efm32_int functions with working ones
[build] Remove PyYAML dependency

This converts all the YAML files to JSON files, as json parsing is built
into python instead of being a separate library requiring installation.

YAML is a superset of JSON, but putting comments in is not quite as obvious
as it is in yaml.

The following glue was used to convert yaml to json:
python -c 'import sys, yaml, json; json.dump(yaml.load(sys.stdin), sys.stdout, indent=4)' < $1 > $2

Clearly I haven't tested this on every single platform, and this
doesn't address the large blobs of yaml in the lpc4300 scripts directory,
only the cortex NVIC generation process.

I've tested a few IRQ driven example apps, and I've checked the generated
output of some known cases like the LM3s that has explicit gaps, and they are
all generated correctly.