refactor: move mod tasks to their own subfolder

Makes the launcher/minecraft/mod/ folder a little more organized.

launcher/minecraft/mod/tasks/ModFolderLoadTask.cpp

@@ -0,0 +1,35 @@
+#include "ModFolderLoadTask.h"
+#include <QDebug>
+
+#include "modplatform/packwiz/Packwiz.h"
+
+ModFolderLoadTask::ModFolderLoadTask(QDir& mods_dir, QDir& index_dir) :
+    m_mods_dir(mods_dir), m_index_dir(index_dir), m_result(new Result())
+{
+}
+
+void ModFolderLoadTask::run()
+{
+    // Read metadata first
+    m_index_dir.refresh();
+    for(auto entry : m_index_dir.entryList()){
+        // QDir::Filter::NoDotAndDotDot seems to exclude all files for some reason...
+        if(entry == "." || entry == "..")
+            continue;
+
+        entry.chop(5); // Remove .toml at the end
+        Mod mod(m_mods_dir, Packwiz::getIndexForMod(m_index_dir, entry));
+        m_result->mods[mod.mmc_id()] = mod;
+    }
+
+    // Read JAR files that don't have metadata
+    m_mods_dir.refresh();
+    for (auto entry : m_mods_dir.entryInfoList())
+    {
+        Mod mod(entry);
+        if(!m_result->mods.contains(mod.mmc_id()))
+            m_result->mods[mod.mmc_id()] = mod;
+    }
+
+    emit succeeded();
+}