quantum: Move qk_ucis_state to process_unicode.c

In order to not declare the same variable in multiple objects (which
happens when building UCIS-enabled keymap for both the ErgoDox EZ and
the ErgoDox Infinity), move the declaration to the .c file, and keep
only an extern reference in the header.

Many thanks to @fredizzimo for spotting the error in Travis, and
suggesting the fix.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

Merge pull request #677 from SmackleFunky/master

Virtual Serial Port - and a Layout that uses that virtual serial port for Plover

move to ergodox-ez only

Remove unneeded include

add missing #include

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

TxBolt (Steno) Serial protocol for Ergodox Ez

Added USB Virtual Serial support

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

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