Refactoring Keymap

Rationale

Make it easier to refactor using the keyboard by adjusting the default keymap to super charge the Option + Command prefix for the most common refactoring actions.

Mechanism

Binding	Action
Option + Command + R	Rename
Option + Command + M	Extract Method
Option + Command + V	Extract Variable
Option + Command + I	Inline
Option + Command + J	Join Lines
Option + Command + Up Arrow	Expand Selection
Option + Command + Down Arrow	Reduce Selection