Merge upstream changes

- These will be added to the KLL Spec 0.4

- Command Line arguments have slightly changed (will require controller git update)
- In preparation for JSON I/O

- Preparing for JSON->kll and kll->JSON compilation modes

- Recent change broke this functionality

- When possible, use the symbolic names for keys in generatedKeymap.h
  e.g. KEY_A instead of 0x04

- Also added some basic usage scenarios

- Name and kll filenames are treated as special variables
- Using the order of the stacks the compilation order can be inferred (useful for debugging)
- Layer names are finally implemented (instead of Layer 1, Layer 2, etc.)

- Adding latest kll git commit rev
- Adding list of changed files since latest git rev
- Adding list of all command line arguments during generation
- Adding generation timestamp
- Updating copyrights

Don't explode into a 20 line stack trace if the kll file is formatted
incorrectly. Instead simply show the error message and exit with an
error code (which will stop the rest of a make command).

A misformatted file is most likely a user error so showing the full
backtrace for debugging is not necessary. The file and line number
should (hopefully) be enough to fix the parsing error.

- Variable support is not complete
- However PartialMap support is basically ready

0x00 is now treated as a special case.

- Layered assignments were lost due to how the cached assignments were replayed
- Replaying each assignment cache after each file is done processing

- To better support RAM/Flash packing adding support for first scan code calculation
- This way if the first scan code is high (e.g. 0x40) RAM is not used for the scan codes without keys assigned

- Some initial work for KLL variables
- Will be used to influence runtime and compiler features of the firmware

- Required to work with Cygwin Python3

- nat_ptr_t is defined in kll.h

- Little endian byte conversion required (has to do with struct assignment rather than architecture)

- Layers never worked previously due to backend bug
- Added base configuration which is automatically clone for replacement, then subtracted for layers if scancode is unused (this allows for partial layer functionality)
- Added default map argument to define a combined map that is different than the typical ANSI map that is used for the base configuration

- Required more complex correlation to get the layer ownership right for each trigger macro from the global list

- Not yet complete
- Partial layers are not compiling properly (adding too many macros, wasting memory)
- Adding example hhkb layout to try out as a layer

- Added USBCode "cached assignment"
- Added ANSI -> Colemak USBCode assignment kll file
- Removed debug printing

- Basic ScanCode to USBCode mapping now generating for the kiibohd controller
- Small fix to template
- Backend
- Macro correlation and transformation

TODO
- More testing
- Analog support
- LED support
- Layer support (only supports default layer currently)

- Not quite complete.
- Most of the parser is done (excluding analog) for 0.3 of the KLL spec
- Transformation and correlation isn't complete yet.
- Backend generation for Kiibohd capabilties is complete.

Includes link to the latest spec.