Option to clear default keybinds

[sumit-modak]

Problem

There are a lot of default keybinds that I have mapped to some other keys and to disable them I have to put no_op in every single one of them.

Proposed Method

An option like disable_default_keybinds that can be set with an array of modes (e.g. normal, select, space`, etc.) to disable default keybinds, which can be useful.