signal: show Windows popup window on crash (#410)

## Link to GitHub Issue, if one exists
#345 

## Description of change
Show a MessageBox when signal detects a crash.

## Testing
Tested full screen and windowed games.

src/spice2x/util/logging.cpp

@@ -1,5 +1,7 @@
 #include "logging.h"
 
+DWORD LOG_FATAL_SLEEP = 10000;
+
 std::string_view log_get_datetime() {
     return log_get_datetime(time(nullptr));
 }