Added a new MidiConvar system to map convar commands to midi inputs (buttons and knobs) Adds "BindKnob" command to map a knob to a command with a float value (eg "BindKnob 0 graphics.fov 70 90" to bind knob 0 to the fov) Adds "BindKeyOn" and "BindKeyOff" to bind a midi note (eg BindKeyOn 60 "graphics.dof_debug true" and BindKeyOff 60 "graphics.dof_debug false") Commands are automatically saved and loaded