Merge pull request #4 from themetalmuncher/master

More SimpleUI app updates
[added] app.css support
[added] example for appCss (in debug-app as usual)
[improved] debug appimage
[improved] apploading
[started] edgedependent positioning
Merge remote-tracking branch 'remotes/upstream/master'
[changed] digital simpleapps to html/css from canvas
[changed] units swapping, now can only click on units
[added] metric/imperial for enginedebug