[Keyboard] E6V2 Bootmapper Client QMK port (#5495)

* initial commit of e6v2 bmc files

* update readme with bmc template and reset key location

* fix up the switch matrix

* add usbconfig.h file

* add i2c files

* cleanup config.h

* cleanup rules.mk and remove non atmega32a architecture code

* add an appropriate keymap for testing

* update readme with warning not to flash this hex file onto atmega32u4 e6v2

* get rgb lights working

* add QMK Configurator support for 60_ansi layout

* add hhkb support layout

* add additional layouts such as tsangan and all and included QMK Configurator support for them

* add bootmagic lite, and have it be set to Esc or the key located at k50

* update readme

* fixup spacing for LAYOUT_all electrical matrix

* add some pragma once magic

* use i2c_master instead of custom i2c.c

* remove the custom i2c.c

* restore a more valid default keymap

* add eep_rst to keymap

1 files changed, 44 insertions, 0 deletions

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+# E6-V2 Bootmapper Client (ps2avrgb)
+
+These docs are for the BMC version of the E6-V2 PCB which has an atmega32a microcontroller. Please do not flash this `.hex` file on your atmega32u4 equipped E6-V2. 
+
+Keyboard Maintainer: [MechMerlin](https://github.com/mechmerlin)  
+Hardware Supported: ps2avrgb E6-V2 with atmega32a microcontroller  
+Hardware Availability: [geekhack.org/index.php?topic=90787.0](https://geekhack.org/index.php?topic=90787.0)  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make exclusive/e6v2/bmc:default
+
+Flashing
+
+ps2avr(GB) boards use an atmega32a microcontroller and a different bootloader. It is not flashable using the regular QMK methods. 
+
+**Reset Key:**  Hold down the key located at `K00`, commonly programmed as left control while plugging in the keyboard. You may also hold down the key located at `K50`, commonly programmed as the escape key. 
+
+Windows: 
+1. Download [HIDBootFlash](http://vusb.wikidot.com/project:hidbootflash).
+2. Place your keyboard into reset. 
+3. Press the `Find Device` button and ensure that your keyboard is found.
+4. Press the `Open .hex File` button and locate the `.hex` file you created.
+5. Press the `Flash Device` button and wait for the process to complete. 
+
+macOS:
+1. Install homebrew by typing the following:   
+    ```
+    /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+    ```
+2. Install `crosspack-avr`.  
+    ```
+    brew cask install crosspack-avr
+    ```
+3. Install the following packages:
+    ```
+    brew install python
+    pip3 install pyusb
+    brew install --HEAD`https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
+
+4. Place your keyboard into reset. 
+5. Flash the board by typing `bootloadHID -r` followed by the path to your `.hex` file. 
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).