new builds menu and modloaders implementation

launcherpaths.cpp

@@ -51,11 +51,21 @@ QString LauncherPaths::profilesFile()
     return rootDir() + QStringLiteral("/profiles.json");
 }
 
-QString LauncherPaths::versionsFile()
+QString LauncherPaths::customBuildsFile()
+{
+    return rootDir() + QStringLiteral("/customBuilds.json");
+}
+
+QString LauncherPaths::legacyCustomBuildsFile()
 {
     return rootDir() + QStringLiteral("/versions.json");
 }
 
+QString LauncherPaths::buildStorageDir()
+{
+    return rootDir() + QStringLiteral("/builds");
+}
+
 QString LauncherPaths::runtimeDir()
 {
     return rootDir() + QStringLiteral("/runtime");
@@ -71,9 +81,20 @@ QString LauncherPaths::versionManifestFile()
     return cacheDir() + QStringLiteral("/version_manifest.json");
 }
 
+QString LauncherPaths::loaderCacheFile(const QString &loaderKey)
+{
+    return cacheDir() + QStringLiteral("/loader_") + loaderKey + QStringLiteral(".json");
+}
+
+QString LauncherPaths::loaderDownloadDir()
+{
+    return cacheDir() + QStringLiteral("/loaders");
+}
+
 bool LauncherPaths::ensureRootExists(QString *error)
 {
-    const QStringList required{rootDir(), runtimeDir(), cacheDir()};
+    const QStringList required{rootDir(), runtimeDir(), cacheDir(),
+                               loaderDownloadDir(), buildStorageDir()};
     for (const QString &path : required) {
         if (!QDir().mkpath(path)) {
             if (error)