This is a hard requirement on Apple platforms and while most other platforms don't have a concept of main thread, all video and input functions should be called on the same thread.
Include SDL_kmsdrmopengles.h before SDL_kmsdrmvulkan.h, as the Vulkan header can pull in Wayland headers, which pull in EGL headers with EGL types defined as Wayland types, which causes warnings when building with strict-aliasing and LTO.
Several functions were redundantly declared in both in the general subsystem header and the GLES header, and some signatures didn't match in both locations.
Move them all to the GLES header, as the definitions are in the GLES source file.
Currently, the rawinput thread incorrectly spreads the timestamps over idle time if the poll interval is less than 100ms, and abruptly switches to lumping all accumulated inputs to happen simultaneously if it exceeds 100ms.
This means that any game which implements retroactive event handling based on timestamps will jarringly snap between the two polar opposite extremes of incorrect behaviour.
This PR replaces the arbitrary 100ms threshold with logic based on measuring the idle start and end time.
If the thread idled for more than 125000 nanoseconds, it is considered to have not had any input in its queue before it entered idle, and the events are spread over the interval between thread wake-up and pump finish, with the final input aligned to the pump finish time.
If the thread idled for less than 125000 nanoseconds, it is considered to have events entered at some point between last pump finish and thread entering sleep, and the events are spread over the full pump-to-pump interval.
If the maximum size was changed to 0 (unbounded) while a minimum was set, the sanity check ensuring that the max size isn't less than the minimum size would incorrectly cause the operation to error out.
