Flush the error log before exit

Currently, some logs can be missing when a fatal error occurs (especially GuestBrokeExecutionException).

This MR attempts to flush logs to console and file before process exit.

src/Ryujinx.HLE/HOS/Kernel/Process/KProcess.cs

@@ -1084,6 +1084,8 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
 
             Logger.Error?.Print(LogClass.Cpu, $"Invalid memory access at virtual address 0x{va:X16}.");
 
+            Logger.Flush();
+
             return false;
         }
 
@@ -1092,6 +1094,8 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
             KernelStatic.GetCurrentThread().PrintGuestStackTrace();
             KernelStatic.GetCurrentThread()?.PrintGuestRegisterPrintout();
 
+            Logger.Flush();
+
             throw new UndefinedInstructionException(address, opCode);
         }
 

src/Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall.cs

@@ -1885,6 +1885,9 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
                     return;
                 }
 
+                Logger.Error?.Print(LogClass.KernelSvc, "The guest program broke execution!");
+                Logger.Flush();
+
                 // TODO: Debug events.
                 currentThread.Owner.TerminateCurrentProcess();