rearranged motor gangs

yeah!
Merge branch 'John'
Merge branch 'master' into John
refactored code to use objects for speed settings

plus button, minus button, and slider bar objects that call  single
functions containing if-blocks to adjusting individuall speeds. We
might be able to go even farther with this
Merge branch 'John'
differently sized buttons

easy for touching on a phone
Merge branch 'John'
Merge branch 'master' into Cole