Feat[auth]: move tokens to keychain

Previously, tokens were saved in json under plain text, making it
insecure. Now, they are stored in iOS's keychian with the hope of
making it more secure.

JavaApp/src/main/java/net/kdt/pojavlaunch/value/MinecraftAccount.java

@@ -21,7 +21,10 @@ public class MinecraftAccount
     }
     
     public static MinecraftAccount parse(String content) throws JsonSyntaxException {
-        return Tools.GLOBAL_GSON.fromJson(content, MinecraftAccount.class);
+        MinecraftAccount account = Tools.GLOBAL_GSON.fromJson(content, MinecraftAccount.class);
+        // Read access token from keychain
+        account.accessToken = getAccessTokenFromKeychain(account.xuid);
+        return account;
     }
     
     public static MinecraftAccount load(String name) throws IOException, JsonSyntaxException {
@@ -39,16 +42,9 @@ public class MinecraftAccount
         }
         return acc;
     }
-/*
-    public static void clearTempAccount() {
-        File tempAccFile = new File(Tools.DIR_BUNDLE, "cache/tempacc.json");
-        tempAccFile.delete();
-    }
 
-    public static void saveTempAccount(MinecraftAccount acc) throws IOException {
-        File tempAccFile = new File(Tools.DIR_DATA, "cache/tempacc.json");
-        tempAccFile.delete();
-        acc.save(tempAccFile.getAbsolutePath());
+    static {
+        System.load(System.getenv("BUNDLE_PATH") + "/PojavLauncher");
     }
-*/
+    public static native String getAccessTokenFromKeychain(String xuid);
 }