Closes #3061 (#3145)

* Good start

* Misc

* Make ApiAuthenticationMiddleware use new json

* Remove first newtonsoft dependency

* Pull latest ASFB json enhancements

* Start reimplementing newtonsoft!

* One thing at a time

* Keep doing all kind of breaking changes which need to be tested later

* Add back ShouldSerialize() support

* Misc

* Eradicate remaining parts of newtonsoft

* WIP

* Workaround STJ stupidity in regards to derived types

STJ can't serialize derived type properties by default, so we'll use another approach in our serializable file function

* Make CI happy

* Bunch of further fixes

* Fix AddFreeLicense() after rewrite

* Add full support for JsonDisallowNullAttribute

* Optimize our json utilities even further

* Misc

* Add support for fields in disallow null

* Misc optimization

* Fix deserialization of GlobalCache in STD

* Fix non-public [JsonExtensionData]

* Fix IM missing method exception, correct db storage helpers

* Fix saving into generic databases

Thanks STJ

* Make Save() function abstract to force inheritors to implement it properly

* Correct ShouldSerializeAdditionalProperties to be a method

* Misc cleanup

* Code review

* Allow JSON comments in configs, among other

* Allow trailing commas in configs

Users very often add them accidentally, no reason to throw on them

* Fix confirmation ID

Probably needs further fixes, will need to check later

* Correct confirmations deserialization

* Use JsonNumberHandling

* Misc

* Misc

* [JsonDisallowNull] corrections

* Forbid [JsonDisallowNull] on non-nullable structs

* Not really but okay

* Add and use ToJson() helpers

* Misc

* Misc

ArchiSteamFarm.CustomPlugins.PeriodicGC/PeriodicGCPlugin.cs

@@ -20,8 +20,10 @@
 // limitations under the License.
 
 using System;
+using System.ComponentModel.DataAnnotations;
 using System.Composition;
 using System.Runtime;
+using System.Text.Json.Serialization;
 using System.Threading;
 using System.Threading.Tasks;
 using ArchiSteamFarm.Core;
@@ -38,8 +40,12 @@ internal sealed class PeriodicGCPlugin : IPlugin {
 	private static readonly object LockObject = new();
 	private static readonly Timer PeriodicGCTimer = new(PerformGC);
 
+	[JsonInclude]
+	[Required]
 	public string Name => nameof(PeriodicGCPlugin);
 
+	[JsonInclude]
+	[Required]
 	public Version Version => typeof(PeriodicGCPlugin).Assembly.GetName().Version ?? throw new InvalidOperationException(nameof(Version));
 
 	public Task OnLoaded() {