[File] [PATCH] Magdir/firmware AVR firmware

[Alexandre IOOSS]

Hello,

I would like to propose a new signature for AVR firmware images.

These binaries start with an interrupt vector table. This tables 
contains 4-byte JMP instructions on larger AVR variants such as the 
Atmega328p, or 2-byte RJMP instructions on smaller AVR variants such as 
Attiny85.
By matching this interrupt vector table, we have enough bits to state 
that a file is an AVR firmware.

Example of output:
```
$ file */*.bin
qmk/ztboards_noon_default.hex.bin:         AVR firmware, reset at 0x01c0
arduino/Blink_attiny_adafruit_trinket.bin: AVR firmware, reset at 0x0023
```

Attached, you will find the new signatures.

Best regards,

-- 
Alexandre
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