Fix uninitialized variables.

especially BOARD_DESIGN_SETTINGS::m_HoleToHoleMin was not initialized, but used in pcbnew when creating a new board

pcbnew/board_design_settings.cpp

@@ -495,6 +495,7 @@ BOARD_DESIGN_SETTINGS::BOARD_DESIGN_SETTINGS() :
     m_MicroViasMinSize    = Millimeter2iu( DEFAULT_MICROVIASMINSIZE );
     m_MicroViasMinDrill   = Millimeter2iu( DEFAULT_MICROVIASMINDRILL );
     m_CopperEdgeClearance = Millimeter2iu( DEFAULT_COPPEREDGECLEARANCE );
+    m_HoleToHoleMin       = Millimeter2iu( DEFAULT_HOLETOHOLEMIN );
 
     m_MaxError            = ARC_HIGH_DEF;
     m_ZoneUseNoOutlineInFill = false;   // Use compatibility mode by default

pcbnew/dialogs/dialog_create_array.cpp

@@ -67,6 +67,7 @@ struct CREATE_ARRAY_DIALOG_ENTRIES
               m_circAngle( 0.0 ),
               m_circCount( 4 ),
               m_circNumberingStartSet( 1 ), // use specified start
+              m_gridCircNumScheme( 0 ),
               m_circNumberingOffset( "1" ),
               m_circNumberingStep( 1 ),
               m_circRotate( false ),

pcbnew/dialogs/panel_modedit_display_options.h

@@ -30,7 +30,7 @@ class PAGED_DIALOG;
 class PANEL_MODEDIT_DISPLAY_OPTIONS : public wxPanel
 {
 public:
-    PANEL_MODEDIT_DISPLAY_OPTIONS( FOOTPRINT_EDIT_FRAME* aParent, PAGED_DIALOG* aWindow );
+    PANEL_MODEDIT_DISPLAY_OPTIONS( FOOTPRINT_EDIT_FRAME* aFrame, PAGED_DIALOG* aParent );
 
 private:
     bool TransferDataToWindow() override;