GH-347 Add timestamp column to mod lists

It shows when the file was changed (in most cases added).

api/logic/minecraft/Mod.cpp

@@ -30,6 +30,7 @@
 Mod::Mod(const QFileInfo &file)
 {
 	repath(file);
+	m_changedDateTime = file.lastModified();
 }
 
 void Mod::repath(const QFileInfo &file)

api/logic/minecraft/Mod.h

@@ -15,6 +15,7 @@
 
 #pragma once
 #include <QFileInfo>
+#include <QDateTime>
 
 class Mod
 {
@@ -86,6 +87,11 @@ public:
 		return m_credits;
 	}
 
+	QDateTime dateTimeChanged() const
+	{
+		return m_changedDateTime;
+	}
+
 	bool enabled() const
 	{
 		return m_enabled;
@@ -118,6 +124,7 @@ protected:
 	*/
 
 	QFileInfo m_file;
+	QDateTime m_changedDateTime;
 	QString m_mmc_id;
 	QString m_mod_id;
 	bool m_enabled = true;

api/logic/minecraft/ModList.cpp

@@ -197,7 +197,7 @@ bool ModList::deleteMods(const QModelIndexList& indexes)
 
 int ModList::columnCount(const QModelIndex &parent) const
 {
-	return 3;
+	return NUM_COLUMNS;
 }
 
 QVariant ModList::data(const QModelIndex &index, int role) const
@@ -220,6 +220,8 @@ QVariant ModList::data(const QModelIndex &index, int role) const
 			return mods[row].name();
 		case VersionColumn:
 			return mods[row].version();
+		case DateColumn:
+			return mods[row].dateTimeChanged();
 
 		default:
 			return QVariant();
@@ -273,6 +275,8 @@ QVariant ModList::headerData(int section, Qt::Orientation orientation, int role)
 			return tr("Name");
 		case VersionColumn:
 			return tr("Version");
+		case DateColumn:
+			return tr("Last changed");
 		default:
 			return QVariant();
 		}
@@ -286,6 +290,8 @@ QVariant ModList::headerData(int section, Qt::Orientation orientation, int role)
 			return tr("The name of the mod.");
 		case VersionColumn:
 			return tr("The version of the mod.");
+		case DateColumn:
+			return tr("The date and time this mod was last changed (or added).");
 		default:
 			return QVariant();
 		}

api/logic/minecraft/ModList.h

@@ -40,7 +40,9 @@ public:
 	{
 		ActiveColumn = 0,
 		NameColumn,
-		VersionColumn
+		DateColumn,
+		VersionColumn,
+		NUM_COLUMNS
 	};
 	ModList(const QString &dir);