Use integer math in techno for polygon positioning

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Invert y orientation when drawing techno polygons

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Start adding techno interference 2

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>