NerD 60 and 80 support

[xauser]

Hello Hasu,

this pull requests adds support for GONs NerD 60 and 80 pcbs. I've also changed the default hotkey for bootloader jump to LSHFT+RSHFT+B as this combination is available on 60% layouts.

Kind regards
xauser

[tmk]

Thanks. Merged.

And instead of changing command/command.c you can have following code in your project directory. This code override default command behaviour. Magic Command code is messy and not maintainable I have a plan to refactor but not near future. Iissue #172)

And I'm contemplateing how to organize keyboard/converter projects better. (Issue #173)

#include "command.h"
#include "bootloader.h"

bool command_extra(uint8_t code)
{             
    switch (code) {
        case KC_B:
            clear_keyboard();
            print("\n\nJump to bootloader... ");
            _delay_ms(1000);
            bootloader_jump(); // not return
            print("not supported.\n");
            break;
    }
    return false;
}