Implement a new settings framework across all of KiCad

CHANGED: Settings are now stored in versioned sub-directories
ADDED: First-run dialog for migrating settings from a previous version
CHANGED: Settings are now stored as JSON files instead of wxConfig-style INI files
CHANGED: Color settings are now all stored in a separate settings file
CHANGED: The symbol editor and footprint editor now have their own settings files
CHANGED: Color settings are no longer exposed through BOARD object
CHANGED: Page layout editor now uses Eeschema's color scheme

Settings are now managed through a central SETTINGS_MANAGER held by PGM_BASE.
Existing settings will be migrated from the wxConfig format on first run of each application.
Per-application settings are now stored in one class for each application.

pcbnew/plot_brditems_plotter.cpp

@@ -40,7 +40,6 @@
 
 #include <board_design_settings.h>            // for BOARD_DESIGN_SETTINGS
 #include <colors.h>                           // for LIGHTGRAY, WHITE
-#include <colors_design_settings.h>           // for COLORS_DESIGN_SETTINGS
 #include <core/typeinfo.h>                    // for dyn_cast, PCB_DIMENSION_T
 #include <eda_text.h>                         // for FILLED, EDA_DRAW_MODE_T
 #include <gal/color4d.h>                      // for COLOR4D, operator!=
@@ -74,7 +73,7 @@
 
 COLOR4D BRDITEMS_PLOTTER::getColor( LAYER_NUM aLayer )
 {
-    COLOR4D color = m_board->Colors().GetLayerColor( aLayer );
+    COLOR4D color = m_colors->GetColor( aLayer );
 
     // A hack to avoid plotting ahite itmen in white color, expecting the paper
     // is also white: use a non white color:
@@ -394,7 +393,7 @@ void BRDITEMS_PLOTTER::PlotDimension( DIMENSION* aDim )
     draw.SetWidth( aDim->GetWidth() );
     draw.SetLayer( aDim->GetLayer() );
 
-    COLOR4D color = m_board->Colors().GetLayerColor( aDim->GetLayer() );
+    COLOR4D color = m_colors->GetColor( aDim->GetLayer() );
 
     // Set plot color (change WHITE to LIGHTGRAY because
     // the white items are not seen on a white paper or screen