Add an option to abort when a panic alert occurs

Prompted by https://dolphin.ci/#/builders/24/builds/985

A 1-character typo in a recent PR caused FifoCI builds to break
horribly and spew millions of panic alerts until buildbot crashed.

This PR adds a new config option -- defaulting to off -- that allows
Dolphin to abort early on when a panic alert occurs instead of
continuing forever.

Source/Core/Common/MsgHandler.cpp

@@ -4,6 +4,7 @@
 #include "Common/MsgHandler.h"
 
 #include <cstdarg>
+#include <cstdlib>
 #include <string>
 
 #ifdef _WIN32
@@ -51,6 +52,7 @@ std::string DefaultStringTranslator(const char* text)
 MsgAlertHandler s_msg_handler = DefaultMsgHandler;
 StringTranslator s_str_translator = DefaultStringTranslator;
 bool s_alert_enabled = true;
+bool s_abort_on_panic_alert = false;
 
 const char* GetCaption(MsgType style)
 {
@@ -94,6 +96,11 @@ void SetEnableAlert(bool enable)
   s_alert_enabled = enable;
 }
 
+void SetAbortOnPanicAlert(bool should_abort)
+{
+  s_abort_on_panic_alert = should_abort;
+}
+
 std::string GetStringT(const char* string)
 {
   return s_str_translator(string);
@@ -114,6 +121,12 @@ bool MsgAlert(bool yes_no, MsgType style, const char* format, ...)
 
   ERROR_LOG_FMT(MASTER_LOG, "{}: {}", caption, buffer);
 
+  // Panic alerts.
+  if (style == MsgType::Warning && s_abort_on_panic_alert)
+  {
+    std::abort();
+  }
+
   // Don't ignore questions, especially AskYesNo, PanicYesNo could be ignored
   if (s_msg_handler != nullptr &&
       (s_alert_enabled || style == MsgType::Question || style == MsgType::Critical))