Add keymap for Razer Blade Pro 17 2021

Frederik Madsenrequested to merge
Zarickan/OpenRGB:razer-blade-17-pro-keymap into master

Added a keymap for the Razer Blade Pro 17 2021, tested on a ISO-UK version of the laptop.

Definition/position of the ANSI \ has not been confirmed/tested.

Edited by Frederik Madsen

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