Merge pull request #68 from tugelbend/develop

Bug fix for #66
Added blob variables to settings.properties

Not implemented in the pde yet
Moved blob tracking variables to config.pde
Added self-portrait of the coder
Legibility
Legibility (continued)
Added some comments to the config parameters
Adding comments to config.pde (continued)
Comments (continued)
Commenting (continued)
Legibility + comments (continued) + removed cropScale from settings.properties
Comments to the settings.properties (explain debug & calib)
Adding a class to handle the Camera preview
ScreenPreview doesn't extend PGraphics anymore
Removed the obsolete shader mirroring
Added camera preview below the calibration menu
Fixed position of the capture thumbnail preview
Added button tester sketch

Shows a different color for each of the 3 can buttons.
For hardware checking.
Commented debug prints
Fixed blobY squishing