[Keyboard] Add new keyboard: Omnikeyish - A replacement PCB for the Northgate Omnikey family (#6167)

* Add omnikeyish keyboard support.

* remove out of date comment

* PCB Rev 1.1 moved Row5's pin to E6, because the teensy++ hangs an onboard LED off D6.

* Move string.h include to .c file

* Add pcb kicad link.

* Add info.json

* Move macro programming to numlock's keyposition, the most useless key on the post model M layout. Force numlock enabled on host at init time, so you're not stuck without a numpad (hopefully)

* Make the macro blink function toggle LEDs from their previous state.

* Use incorrect but code style compliant opening curly bracing style.

* Make PCB rev 1.1 the default Omnikeyish config, as the author has the only rev 1.0 boards that'll ever be.

* Fix silly spelling error in 3 defines

* First set of review changes.

* Layout macro and keymap defined using it.

* Layout macros for the northgate factory plates.

* minor rearrangements

* ALL the layouts.

* Forgot ultra-t in info.json

keyboards/omnikeyish/rules.mk

@@ -0,0 +1,65 @@
+# keyboard specific files
+SRC += dynamic_macro.c
+
+# MCU name
+MCU = at90usb1286
+
+# Processor frequency.
+#     This will define a symbol, F_CPU, in all source code files equal to the
+#     processor frequency in Hz. You can then use this symbol in your source code to
+#     calculate timings. Do NOT tack on a 'UL' at the end, this will be done
+#     automatically to create a 32-bit value in your source code.
+#
+#     This will be an integer division of F_USB below, as it is sourced by
+#     F_USB after it has run through any CPU prescalers. Note that this value
+#     does not *change* the processor frequency - it should merely be updated to
+#     reflect the processor speed set externally so that the code can use accurate
+#     software delays.
+F_CPU = 16000000
+
+#
+# LUFA specific
+#
+# Target architecture (see library "Board Types" documentation).
+ARCH = AVR8
+
+# Input clock frequency.
+#     This will define a symbol, F_USB, in all source code files equal to the
+#     input clock frequency (before any prescaling is performed) in Hz. This value may
+#     differ from F_CPU if prescaling is used on the latter, and is required as the
+#     raw input clock is fed directly to the PLL sections of the AVR for high speed
+#     clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
+#     at the end, this will be done automatically to create a 32-bit value in your
+#     source code.
+#
+#     If no clock division is performed on the input clock inside the AVR (via the
+#     CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
+F_USB = $(F_CPU)
+
+# Interrupt driven control endpoint task(+60)
+OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
+
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   atmega32a    bootloadHID
+BOOTLOADER = halfkay
+
+
+# Build Options
+#   comment out to disable the options.
+#
+BOOTMAGIC_ENABLE = lite	# Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no	# Mouse keys
+EXTRAKEY_ENABLE = yes	# Audio control and System control
+CONSOLE_ENABLE = yes	# Console for debug
+COMMAND_ENABLE = yes    # Commands for debug and configuration
+SLEEP_LED_ENABLE = no 	# Breathing sleep LED during USB suspend
+NKRO_ENABLE = yes		# USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = no  	# Enable keyboard backlight functionality
+AUDIO_ENABLE = no
+RGBLIGHT_ENABLE = no