Implemented version lists.

Further work on this is still needed. Currently there is no sorting or filtering of any kind. In addition,
changes need to be made to fix issues with bad ETags since the current system here is based on MultiMC 4's
version list system before it was fixed.

libmultimc/src/instversionlist.cpp

@@ -17,7 +17,7 @@
 #include "instversion.h"
 
 InstVersionList::InstVersionList(QObject *parent) :
-	QObject(parent)
+	QAbstractListModel(parent)
 {
 }
 
@@ -30,3 +30,96 @@ const InstVersion *InstVersionList::findVersion(const QString &descriptor)
 	}
 	return NULL;
 }
+
+// Column Enum
+enum VListColumns
+{
+	// First column - Name
+	NameColumn = 0,
+	
+	// Second column - Type
+	TypeColumn,
+	
+	// Column count
+	ColCount
+};
+
+QVariant InstVersionList::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid())
+		return QVariant();
+	
+	if (index.row() > count())
+		return QVariant();
+	
+	
+	const InstVersion *version = at(index.row());
+	
+	switch (role)
+	{
+	case Qt::DisplayRole:
+		switch (index.column())
+		{
+		case NameColumn:
+			return version->name();
+			
+		case TypeColumn:
+			return version->typeName();
+			
+		default:
+			return QVariant();
+		}
+		
+	case Qt::ToolTipRole:
+		return version->descriptor();
+		
+	default:
+		return QVariant();
+	}
+}
+
+QVariant InstVersionList::headerData(int section, Qt::Orientation orientation, int role) const
+{
+	switch (role)
+	{
+	case Qt::DisplayRole:
+		switch (section)
+		{
+		case NameColumn:
+			return "Name";
+			
+		case TypeColumn:
+			return "Type";
+		
+		default:
+			return QVariant();
+		}
+		
+	case Qt::ToolTipRole:
+		switch (section)
+		{
+		case NameColumn:
+			return "The name of the version.";
+			
+		case TypeColumn:
+			return "The version's type.";
+		
+		default:
+			return QVariant();
+		}
+		
+	default:
+		return QVariant();
+	}
+}
+
+int InstVersionList::rowCount(const QModelIndex &parent) const
+{
+	// Return count
+	return count();
+}
+
+int InstVersionList::columnCount(const QModelIndex &parent) const
+{
+	return ColCount;
+}