[improved] speedo at speeds>160, lots of speedo cleanup
[fixed] speedo units persistance
[added] engine debug app (wip)
[improved] stats debug formatting + speedo units
[removed] nonfunctional fuel economy code, todo
[added] engine rpm debug app
[fixed] rpmdebug rpm display artefact
[added] css for simple apps, updated apps
Merge pull request #2 from themetalmuncher/master

More SimpleUI app updates