refactor: move general info from Mod to Resource

This allows us to create other resources that are not Mods, but can
still share a significant portion of code.

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/modplatform/EnsureMetadataTask.cpp

@@ -110,7 +110,7 @@ void EnsureMetadataTask::executeTask()
         }
 
         // Folders don't have metadata
-        if (mod->type() == Mod::MOD_FOLDER) {
+        if (mod->type() == ResourceType::FOLDER) {
             emitReady(mod);
         }
     }