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>

source/store/meta.cpp

@@ -1,6 +1,6 @@
 /*
 *   This file is part of Universal-Updater
-*   Copyright (C) 2019-2020 Universal-Team
+*   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
@@ -83,6 +83,7 @@ void Meta::ImportMetadata() {
 	const std::string &entry: The Entry name.
 */
 std::string Meta::GetUpdated(const std::string &unistoreName, const std::string &entry) const {
+	if (this->metadataJson.is_discarded()) return "";
 	if (!this->metadataJson.contains(unistoreName)) return ""; // UniStore Name does not exist.
 
 	if (!this->metadataJson[unistoreName].contains(entry)) return ""; // Entry does not exist.
@@ -102,6 +103,8 @@ std::string Meta::GetUpdated(const std::string &unistoreName, const std::string
 int Meta::GetMarks(const std::string &unistoreName, const std::string &entry) const {
 	int temp = 0;
 
+	if (this->metadataJson.is_discarded()) return temp;
+
 	if (!this->metadataJson.contains(unistoreName)) return temp; // UniStore Name does not exist.
 
 	if (!this->metadataJson[unistoreName].contains(entry)) return temp; // Entry does not exist.
@@ -127,6 +130,25 @@ bool Meta::UpdateAvailable(const std::string &unistoreName, const std::string &e
 	return false;
 }
 
+/*
+	Get the marks.
+
+	const std::string &unistoreName: The UniStore name.
+	const std::string &entry: The Entry name.
+*/
+std::vector<std::string> Meta::GetInstalled(const std::string &unistoreName, const std::string &entry) const {
+	if (this->metadataJson.is_discarded()) return { };
+
+	if (!this->metadataJson.contains(unistoreName)) return { }; // UniStore Name does not exist.
+
+	if (!this->metadataJson[unistoreName].contains(entry)) return { }; // Entry does not exist.
+
+	if (!this->metadataJson[unistoreName][entry].contains("installed")) return { }; // marks does not exist.
+
+	if (this->metadataJson[unistoreName][entry]["installed"].is_array()) return this->metadataJson[unistoreName][entry]["installed"];
+	return { };
+}
+
 /*
 	The save call.