System: Add a new throttler/pacer which can catch up on lost time

This can result in worse frame pacing, so if you have a decent machine
you'll probably want to turn on "display all frames" in display
settings.

But, it's sadly needed for Android.

src/core/host_interface.cpp

@@ -545,6 +545,7 @@ void HostInterface::SetDefaultSettings(SettingsInterface& si)
   si.SetBoolValue("Display", "ShowResolution", false);
   si.SetBoolValue("Display", "Fullscreen", false);
   si.SetBoolValue("Display", "VSync", true);
+  si.SetBoolValue("Display", "DisplayAllFrames", false);
   si.SetStringValue("Display", "PostProcessChain", "");
   si.SetFloatValue("Display", "MaxFPS", 0.0f);