Add hid_flash.exe for windows#33

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BennehBoy wants to merge 2 commits intostm32duino:masterfrom

BennehBoy:HIDBootLoader

Commits on Jan 20, 2019

Add hid_flash.exe for windows
BennehBoy
committed

Commits on Jan 22, 2019

Added MacOS & Linux tools & Updated to HID BootLoader V3.0
BennehBoy
committed