Add queue system with background downloading and much more (#73)

* Do not build here until it is merged.

* WIP: Queue System.

Right now crashes randomly for whatever reason..

* Animate queue spinner more slowly

* Use LightLocks to prevent crashing in the queue

(I hope it's fixed at least)

* Build nightlies in queue-system

* Use version.h for version and specify 7 digits

* Remove unneeded $(CURDIR)

I put that these for testing, but it's not needed

* Multiple Changes, see desc for more.

1.) Theme Implementation.
2.) Show Battery + Time.
3.) Some more work on Queue-System (might still be broke).
4.) Update Copyright to 2021.
5.) Add `%FIRM%` to regex.
6.) Mass Add to Queue.
7.) Search with AND / OR filter.

* Gaaah, not again...

* Remove DoNothing, some LightLock changes, etc

aka
Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.

* See desc for more.

- Current Queue Entry can now be canceled.

- Fix installed list.

- Display Download Speed.

- BYE BYE Queue LightLock!

* Various adjustments to the queue menu

- Make cancel button slightly smaller
- Right align "Steps: ..." text
- Remove "Current Operation:" text
- Change KB/MB/GB to KiB/MiB/GiB
- Lots of little positioning tweaks
- Fix bug where you could get stuck in the prompt
- Make spinny thing have a ! when action is needed
- Make extracting file increment at the start instead of the end
- Delete dumb VS Code file and gitignore it

* Change to hollow full charge plugged in icon

* Fix the settings positions a bit

* Fix custom font download not having prompt

Also tweak the text positions, I forgot to change them

Co-authored-by: StackZ <47382115+SuperSaiyajinStackZ@users.noreply.github.com>

include/utils/queueSystem.hpp

@@ -0,0 +1,82 @@
+/*
+*   This file is part of Universal-Updater
+*   Copyright (C) 2019-2021 Universal-Team
+*
+*   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, either version 3 of the License, or
+*   (at your option) any later version.
+*
+*   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 <http://www.gnu.org/licenses/>.
+*
+*   Additional Terms 7.b and 7.c of GPLv3 apply to this file:
+*       * Requiring preservation of specified reasonable legal notices or
+*         author attributions in that material or in the Appropriate Legal
+*         Notices displayed by works containing it.
+*       * Prohibiting misrepresentation of the origin of that material,
+*         or requiring that modified versions of such material be marked in
+*         reasonable ways as different from the original version.
+*/
+
+#ifndef _UNIVERSAL_UPDATER_QUEUE_SYSTEM_HPP
+#define _UNIVERSAL_UPDATER_QUEUE_SYSTEM_HPP
+
+#include "json.hpp"
+#include <citro2d.h>
+#include <deque>
+#include <memory>
+
+/* Extend this, if more statuses are neccessary. */
+enum class QueueStatus {
+	None,
+	Copying,
+	Deleting,
+	Downloading,
+	Extracting,
+	Installing,
+	Moving,
+	Request, // For User needed Requests.
+	Failed,
+	Done
+};
+
+enum RequestType {
+	PROMPT_RET = -3,
+	NO_REQUEST = -1,
+	RMDIR_REQUEST = 1, // remove dir prompt request.
+	PROMPT_REQUEST = 2, // skip prompt request.
+	PROMPT_ERROR = 3 // Error message prompt. Unused right now.
+};
+
+class Queue {
+public:
+	Queue(nlohmann::json object, const C2D_Image &img, const std::string &name, const std::string &uName, const std::string &eName, const std::string &lUpdated) :
+		obj(object), icn(img), name(name), unistoreName(uName), entryName(eName), lastUpdated(lUpdated) { };
+
+	QueueStatus status = QueueStatus::None;
+	nlohmann::json obj;
+	C2D_Image icn;
+	int total, current;
+	std::string name = "", unistoreName = "", entryName = "", lastUpdated = "";
+};
+
+/* Of course also a namespace to that part, so we can do that in a Thread. */
+namespace QueueSystem {
+	extern int RequestNeeded, RequestAnswer;
+	extern std::string RequestMsg, EndMsg;
+	extern int LastElement;
+	extern bool Wait, Popup, CancelCallback;
+
+	void QueueHandle(); // Handles the Queue.
+	void AddToQueue(nlohmann::json obj, const C2D_Image &icn, const std::string &name, const std::string &uName, const std::string &eName, const std::string &lUpdated); // Adds to Queue.
+	void ClearQueue(); // Clears the Queue.
+	void Resume();
+};
+
+#endif