OpenTK.Graphics 5.0.0-pre.13

Changed MarshalTk.MarshalStringArrayToAnsiStringArrayPtr to take ReadOnlySpan<string> instead of Span<string>. (@NogginBops) Vulkan bindings changes**: Add default parameterless constructor to all Vulkan structs so that default member values can be applied (mostly to automatically set sType). (@NogginBops) Made the Vulkan example project render a triangle. (@NogginBops) OpenGL bindings changes**: Skip ref readonly for singular Delete*() functions. (@NogginBops) Added generated EGL bindings containing all EGL and ANGLE extensions. (@NogginBops) Fixed missing documentation on some OpenGL functions. (@NogginBops) PAL2 changes**: A lot of documentation improvements. (@NogginBops) Added Toolkit.Window.Get/SetTransparencyMode to support different modes for window transparency. (@NogginBops) Add reason parameter to Toolkit.Shell.AllowScreenSaver. (@NogginBops) Add Toolkit.Shell.IsScreenSaverAllowed to be able to check if the screen saver is disabled. (@NogginBops) Added OpenGLGraphicsApiHints.SupportsTransparentFramebufferX11 to mark if the context values selector should look for formats that support framebuffer transparency when on X11 (framebuffer transparency is always supported on Windows and macOS). (@NogginBops) Added ContextValues.SupportsFramebufferTransparency to check if a particular format supports framebuffer transparency (only relevant on X11). (@NogginBops) Updated ContextValues.DefaultValuesSelector to handle SupportsFramebufferTransparency. (@NogginBops) Added Toolkit.Uninit() for usecases where unloading OpenTK is useful (don't call this function on application exit). (@NogginBops) Added IPalComponent.Uninitialize() and implemented it for every component on every platform to make Toolkit.Uninit() possible. (@NogginBops) win32: macOS: Implement MacOSVulkanComponent using MoltenVK. (@NogginBops) Made dialogs proper window sheets by default. (@NogginBops) Added MacOSDialogComponent.Show*NoWindow functions for showing dialogs not attached to any window. (@NogginBops) x11: Fixed glX dll resolution to be the same as before 5.0-pre.12 (@NogginBops) Fixed memory leak in X11KeyboardComponent. (@NogginBops) ANGLE: Switched implementation to use the generated EGL bindings. (@NogginBops)