Improved Logger (#1292)

* Logger class changes only

Now compile-time checking is possible with the help of Nullable Value
types.

* Misc formatting

* Manual optimizations

PrintGuestLog
PrintGuestStackTrace
Surfaceflinger DequeueBuffer

* Reduce SendVibrationXX log level to Debug

* Add Notice log level

This level is always enabled and used to print system info, etc...
Also, rewrite LogColor to switch expression as colors are static

* Unify unhandled exception event handlers

* Print enabled LogLevels during init

* Re-add App Exit disposes in proper order

nit: switch case spacing

* Revert PrintGuestStackTrace to Info logs due to #1407

PrintGuestStackTrace is now called in some critical error handlers
so revert to old behavior as KThread isn't part of Guest.

* Batch replace Logger statements

Ryujinx.HLE/HOS/Services/Sockets/Nsd/IManager.cs

@@ -221,7 +221,7 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Nsd
             // TODO: Call nn::nsd::detail::fs::ReadSaveDataWithOffset() at offset 0 to write the 
             //       whole savedata inside the buffer.
 
-            Logger.PrintStub(LogClass.ServiceNsd);
+            Logger.Stub?.PrintStub(LogClass.ServiceNsd);
 
             return ResultCode.Success;
         }