System firmware installer (#791)

* firmware installer

* Add directory installation option and fix 9.x support for directory

* Fix missing system font error while installing for the first time

* Address code style comments

* Create and use InvalidFirmwarePackageException

* Fix LDj3SNuD's comments

* addressed alex's comments

* add label to status bar to show current firmware version

Co-authored-by: Thog <thog@protonmail.com>

Ryujinx.HLE/HOS/Horizon.cs

@@ -715,6 +715,21 @@ namespace Ryujinx.HLE.HOS
             }
         }
 
+        public SystemVersion VerifyFirmwarePackage(string firmwarePackage)
+        {
+            return ContentManager.VerifyFirmwarePackage(firmwarePackage);
+        }
+
+        public SystemVersion GetCurrentFirmwareVersion()
+        {
+            return ContentManager.GetCurrentFirmwareVersion();
+        }
+
+        public void InstallFirmware(string firmwarePackage)
+        {
+            ContentManager.InstallFirmware(firmwarePackage);
+        }
+
         public void SignalVsync()
         {
             VsyncEvent.ReadableEvent.Signal();