Add option to turn off playlist alternating row colors

src/playlist/playlistview.cpp

@@ -1155,6 +1155,7 @@ void PlaylistView::ReloadSettings() {
   bool editmetadatainline = s.value("editmetadatainline", false).toBool();
   select_track_ = s.value("select_track", false).toBool();
   auto_sort_ = s.value("auto_sort", false).toBool();
+  setAlternatingRowColors(s.value("alternating_row_colors", true).toBool());
   s.endGroup();
 
   s.beginGroup(AppearanceSettingsPage::kSettingsGroup);

src/settings/playlistsettingspage.cpp

@@ -52,6 +52,8 @@ void PlaylistSettingsPage::Load() {
   QSettings s;
   s.beginGroup(kSettingsGroup);
 
+  ui_->checkbox_alternating_row_colors->setChecked(s.value("alternating_row_colors", true).toBool());
+
 #ifdef Q_OS_MACOS
   bool glow_effect = false;
 #else
@@ -118,6 +120,7 @@ void PlaylistSettingsPage::Save() {
 
   QSettings s;
   s.beginGroup(kSettingsGroup);
+  s.setValue("alternating_row_colors", ui_->checkbox_alternating_row_colors->isChecked());
   s.setValue("glow_effect", ui_->checkbox_glowcurrenttrack->isChecked());
   s.setValue("warn_close_playlist", ui_->checkbox_warncloseplaylist->isChecked());
   s.setValue("continue_on_error", ui_->checkbox_continueonerror->isChecked());

src/settings/playlistsettingspage.ui

@@ -14,6 +14,13 @@
    <string>Playlist</string>
   </property>
   <layout class="QVBoxLayout" name="layout_playlistsettingspage">
+   <item>
+    <widget class="QCheckBox" name="checkbox_alternating_row_colors">
+     <property name="text">
+      <string>Use alternating row colors</string>
+     </property>
+    </widget>
+   </item>
    <item>
     <widget class="QCheckBox" name="checkbox_glowcurrenttrack">
      <property name="text">