Fetcher doesn't stop when you release the joystick

[robot256]

When you release the fetcher joystick, the commands stops changing but the fetcher keeps trying to catch up with it. Additionally, when the fetcher is on the way to a preset and the driver moves the joystick, it should abort the preset move and control from the current position.

Solution:

1. Keep track of the previous joystick value.
2. Make a state flag for fetcherGoingToPreset, and set it true in fetcherToPreset and fetcherToValue.
3. When the joystick changes from positive to (zero or negative), OR from negative to (zero or positive), call stopExtension.
4. When the joystick is not zero, if fetcherGoingToPreset is true, make it false and call stopExtension.
5. After those checks are complete, regardless of the outcome, if joystick is not 0, call controlExtension.

[robot256]

Code will (almost) function. I added some comments about formatting and variable placement.

[robot256]

Tested working, good enough!