feat: display license and issue tracker

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

launcher/minecraft/mod/Mod.h

@@ -68,6 +68,8 @@ public:
     auto authors()     const -> QStringList;
     auto status()      const -> ModStatus;
     auto provider()    const -> std::optional<QString>;
+    auto licenses()     const -> const QList<ModLicense>&;
+    auto issueTracker() const -> QString;
 
     /** Get the intneral path to the mod's icon file*/
     QString iconPath() const { return m_local_details.icon_file; };