Move plugins to Sol (#5622)

Co-authored-by: Nerixyz <nerixdev@outlook.de>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/controllers/plugins/PluginController.hpp

@@ -10,6 +10,7 @@
 #    include <QJsonArray>
 #    include <QJsonObject>
 #    include <QString>
+#    include <sol/forward.hpp>
 
 #    include <algorithm>
 #    include <map>
@@ -66,11 +67,16 @@ private:
               const PluginMeta &meta);
 
     // This function adds lua standard libraries into the state
-    static void openLibrariesFor(lua_State *L, const PluginMeta & /*meta*/,
-                                 const QDir &pluginDir);
+    static void openLibrariesFor(Plugin *plugin);
+
+    static void initSol(sol::state_view &lua, Plugin *plugin);
+
     static void loadChatterinoLib(lua_State *l);
     bool tryLoadFromDir(const QDir &pluginDir);
     std::map<QString, std::unique_ptr<Plugin>> plugins_;
+
+    // This is for tests, pay no attention
+    friend class PluginControllerAccess;
 };
 
 }  // namespace chatterino