Fix several compile issues (#261)

Fixed several code issues.  Mostly pedantic compiler warnings.  But also a sign issue exposed by newer compilers (#228, #260)

glabels/ColorPaletteItem.cpp

@@ -36,8 +36,6 @@ namespace glabels
 		const int     wSwatch = 25;
 		const int     hSwatch = 25;
 
-		const int     hoverBgOutlineWidthPixels = 1;
-
 		const int     outlineWidthPixels = 1;
 	}
 

glabels/LabelEditor.cpp

@@ -823,7 +823,8 @@ namespace glabels
 		/*
 		 * Calculate new size
 		 */
-		double w, h;
+		double w = 0.0;
+		double h = 0.0;
 		switch ( mResizeHandleLocation )
 		{
 		case model::Handle::NW:

glabels/TemplatePicker.cpp

@@ -130,7 +130,7 @@ namespace glabels
 	{
 		model::Settings::setTemplatePickerMode( mode );
 		
-		for ( unsigned int i = 0; i < count(); i++ )
+		for ( int i = 0; i < count(); i++ )
 		{
 			if (auto* tItem = dynamic_cast<TemplatePickerItem *>(item(i)))
 			{
@@ -182,7 +182,7 @@ namespace glabels
 	                                  bool isoMask, bool usMask, bool otherMask,
 	                                  bool anyCategory, const QStringList& categoryIds )
 	{
-		for ( unsigned int i = 0; i < count(); i++ )
+		for ( int i = 0; i < count(); i++ )
 		{
 			if (auto* tItem = dynamic_cast<TemplatePickerItem *>(item(i)))
 			{
@@ -232,7 +232,7 @@ namespace glabels
 	///
 	void TemplatePicker::applyFilter( const QStringList& names )
 	{
-		for ( unsigned int i = 0; i < count(); i++ )
+		for ( int i = 0; i < count(); i++ )
 		{
 			if (auto *tItem = dynamic_cast<TemplatePickerItem *>(item(i)))
 			{