Merge remote-tracking branch 'upstream/master'

# Conflicts:
#	keyboards/planck/keymaps/dbroqua/keymap.c

Merge pull request #671 from Talljoe/one-hand

Add native one-handed support

Merge pull request #673 from coderkun/master

Add method to set Unicode input key for ISO 14755

Merge pull request #675 from Xyverz/master

Added missing item K3A to KEYMAP() variable in tv44.h

Merge pull request #676 from ickerwx/kitten_paw

Added support for the Kitten Paw controller

- Added PrintScreen key on multimedia layer

Added support for the Kitten Paw controller

This adds support for the 2016 revision of the Kitten Paw [1] replacement
controller by Bathroom Epiphanies.

[1] http://bathroomepiphanies.com/controllers/

Merge remote-tracking branch 'upstream/master'

Added missing key K3A to KEYMAP() macro in tv44.h

Merge pull request #669 from fredizzimo/windows10_build_instructions

Add instructions for Windows 10 subsystem for Linux

Merge pull request #668 from fredizzimo/line_endings

Enforce correct line endings

Merge pull request #674 from kyleberry/master

Fixing Dvorak

- Inverted key Tab and Esc
- Reorganised bottom row

Fixing Dvorak

Updating with proper Dvorak layout.

Drop method to set Unicode input key and declare start and finish methods as “weak” instead

Add method to set Unicode input key for ISO 14755

https://github.com/jackhumbert/qmk_firmware/issues/672

Add one-hand key to planck/experimental keymap.

Add default swap configs for a couple of boards.

Improve one-hand support by adding more actions and tap keys.

Add one-hand support.

This adds an action, `ACTION_SWAP_HANDS`, that swaps the the keys on the keyboard across a keymap-defined hemisphere in order to support one-hand typing without requiring a separate one-handed layer. See updated `doc/keymap.md` for more information.