fix for BigM traffic collision

closes #36
automatic covers bugfix and update
check if combine still exists before calc. dist.
fix fruit check backup when combine not in mode6
Change color on button hover, quick mode switch

- hovering on buttons (no text hover, for now) changes the button's
color
- page 1: quick switch buttons to quickly switch the active mode
mode8: fix for not stopping at slurry trigger

also support for ManureLager (yet to be released)
delete print for mouseInput button
Merge remote-tracking branch 'upstream/master'