Added basic java auto-detect and auto-download

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/minecraft/launch/AutoInstallJava.h

@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  Prism Launcher - Minecraft Launcher
+ *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ *      Copyright 2013-2021 MultiMC Contributors
+ *
+ *      Licensed under the Apache License, Version 2.0 (the "License");
+ *      you may not use this file except in compliance with the License.
+ *      You may obtain a copy of the License at
+ *
+ *          http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *      Unless required by applicable law or agreed to in writing, software
+ *      distributed under the License is distributed on an "AS IS" BASIS,
+ *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *      See the License for the specific language governing permissions and
+ *      limitations under the License.
+ */
+
+#pragma once
+
+#include <launch/LaunchStep.h>
+#include <launch/LaunchTask.h>
+#include "java/JavaMetadata.h"
+#include "meta/Version.h"
+#include "minecraft/MinecraftInstance.h"
+#include "tasks/Task.h"
+
+class AutoInstallJava : public LaunchStep {
+    Q_OBJECT
+
+   public:
+    explicit AutoInstallJava(LaunchTask* parent);
+    ~AutoInstallJava() override = default;
+
+    void executeTask() override;
+    bool canAbort() const override { return m_current_task ? m_current_task->canAbort() : false; }
+
+   protected:
+    void setJavaPath(QString path);
+    void setJavaPathFromPartial();
+    void downloadJava(Meta::Version::Ptr version, QString javaName);
+    void tryNextMajorJava();
+
+   private:
+    MinecraftInstancePtr m_instance;
+    Task::Ptr m_current_task;
+
+    qsizetype m_majorJavaVersionIndex = 0;
+    const QString m_supported_arch;
+};