Raiscube LCD12864 upgrades

Some useful additions to the Raiscube LCD12864 control unit. This comes originally with some big holes and a knob which was visibly just "thrown on", exposing the whole under-structure of the encoder. Reset switch is easy to damage behind its hole as it has a long shaft. Buzzer in the middle of the third hole without a proper cover is awful as well.

So I decided to improve a little :) Some details:

- knob is 20mm dia at bottom, 12mm at the fingergrip. 17mm total height, its a tight fit on a usual 6mm 18-teeth splined shaft.
- reset button clicks in its hole and its a loose fit so can move in and out in order to push - release microswitch. Fits into 12mm hole.
- buzzer cover same method but tight fit into 14mm hole.
- I changed the original distance washers (white ones) to correctly sized pieces as they were too low, so display was not parallel to box surface. Dimensions are 3mm ID 7mm OD 5.5mm height. Simply separate them by breaking the little bridge in between them :)