Changes to file tree

Changed image folder to "appearance" module which will hold some python
files, such as those defining color schemes, in the future.
Fixed stepper motor issues

It is not as elegant as planned, but the user can set the number of
steps per layer, then move up by layer.
Switch from 'images' to 'appearance'

Also changed the way schemes work a little, more changes in the near
future.
Improved and updated dynamic editor types
Added settings editor pane and added it to menu
Merge branch 'master' of https://github.com/SaratogaEDD2014/RapidPrototyper