Feature/magick.net (#69)

* Started to implement MagickImage and removed all FileToVoxCommon namespace

* Heightmap is now working with 16-bit per channel

* Fixed the average which depend on the number of channel per pixel

* Create static method Quantize to centralize all vertifications

* Removed JsonPresets folder

* Removed SimpleSingleton

* Removed dependency to the old Quantizer which depends on Bitmap (not compatible on Mac).
WIP quantizer, not really best results

* Removed folder Quantizer

* Fixed parsing pixel color in MultipleImageToSchematic

* Clean code

* Removed dependency to System.Drawing also in PaletteSchematicConverter

Fixed missing config.txt for schematic files

Fixed missing config.txt for schematic files

Fixed minimum of files to consider for processing multiple images con…

…verter

Update README.md

Merge branch 'feature/scale_rework'

Hotfix about generation of heightmap with color option enabled withou…

…t cm

Fixed conversion with color image file

Added System.Drawing for osx