Deleted RotaryKnob
Deleted AbsSweepedKnob
MainActivity uses Knob

Used to use RotaryKnob, but that class is deleted.
Main layout uses Knob
Revert "Main layout uses Knob"

This reverts commit 2947f50cf799e79351f201327336f4f923b30268.
Revert "Revert "Main layout uses Knob""

This reverts commit 4916d5f9113ee375751944342d9d9c652678d0d8.
Revert "Main layout uses Knob"

This reverts commit 2947f50cf799e79351f201327336f4f923b30268.
Revert "Revert "Main layout uses Knob""

This reverts commit 14fd7f60b0fea1154b2cafd8cec5d88323c9fb86.
Removed debug messages

FUCKING GIT. I accidentally committed Knob.java, which I did NOT want to
do. Unfortunately, it is impossible to revert that commit without also
overwriting all the changes that I made.

So, for now, I am committing the (broken) Knob.java code to the repo,
and removing the debug messages. For now.