antimicrox Increase the number of buttons

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Is your feature request related to a problem? Please describe.

My Game Controller is Fiydigi Vader 2 . It has four back buttons and two additional front buttons ("C" "Z") . In the AntiMicoX 3.32, "Controller Mapping" didn't reserve their place . They can map Strings in a preemptive way ( Should I describe it this way, I have just contacted AntiMicroX, and I do not know the underlying logic, String, API or SDL2 ) . "Options"--> "property"-->"buttons" can detect these 6 buttons, but cannot respond ( blue ) unless in a preemptive way . The main page can also show them button 16～ button 21, as if they are eagerly waiting to map a keyboard letter。 How should I read the source code and modify it，detect --> respond --> map a letter。

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