This allows users to right click on just about any name in the GUI (e.g. "PWM[0]") and rename it (e.g. "Left Motor [0]"). The index portion is not editable. The name is saved into imgui.ini so it's persistent.
This uses Dear Imgui to provide a cross-platform integrated GUI for robot
simulation. The GUI provides fully integrated DS and joystick support so it's
not necessary to run the official DS.
