buttonrebinds: add support for keyboard rebinding

Harald Sitterrequested to merge
work/sitter/rebind-keyboards into master

uses existing Key handling

the relevant config format is for kcminputrc:

[ButtonRebinds][Keyboard][Razer Razer Orbweaver]
87=Key,X

where the device name is from libinput list-devices, 87 is the Qt key code for Key_W and X can be a QKeySequence.

This feature will enable us to remap keyboard-style devices such as gaming mice and gaming keypads.

FEATURE: 502639

Edited by Nate Graham

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