Added a way to access logical_dst_rect

[Ethanscharlie]

SDL_GetLogicalRect function to get the logical destination rect

** This was my origin issue ** I need to know where it is to correctly draw an imgui panel, for logical rendering I have to turn it off before I render the imgui frame, because of that I need to know where to put the frame, and that involves the offset that the logical rect is from 0, 0 because of how it is pushed to the middle with letterboxing, currently I am using a modified version of the UpdateLogicalPresentation method to get the rect, but this should just be a sdl feature